diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..b3687c2
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,2 @@
+gem sinatra
+gem sinatra-cross_origin
diff --git a/README.md b/README.md
index c52a33e..25a17e4 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
-# Goals:
+# Note
 
+This is now directed at the `src` folder. The `game` folder is old code and is
+kept for example stuff.
+
+# Goals:
 
 Make a multiplayer game that will run in the browser. This game should be a
 planet conquest type game where you can create a lobby and then players can
@@ -43,11 +47,12 @@ I do eventually want to have AI players however for now I just want human
 players. Make sure that you help me to keep this easy as I am programming.
 
 Here are the resources that I am thinking of for now:
- - Food
- - Metal
- - Fuel/energy
- - Crystals
- - Galaxy Credits (Universal money)
+ - Food (Local to planet)
+ - Energy (Local to planet)
+ - Metal (Global)
+ - Fuel (Global)
+ - Crystals (Global)
+ - Galaxy Credits (Global)
 
 
 How do we have resources travel be tween planets? I am not sure yet. Maybe have
diff --git a/core/.rspec b/core/.rspec
new file mode 100644
index 0000000..c99d2e7
--- /dev/null
+++ b/core/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/core/Rakefile b/core/Rakefile
new file mode 100644
index 0000000..04f0ae6
--- /dev/null
+++ b/core/Rakefile
@@ -0,0 +1,34 @@
+# Nathan Hinton 2 Oct 2025
+# Rake file
+
+
+desc 'Run RSpec tests'
+task :test do
+  begin
+    require 'rspec/core/rake_task'
+    RSpec::Core::RakeTask.new(:spec)
+    Rake::Task['spec'].invoke
+  rescue LoadError
+    puts 'Failed to load RSpec to run tests... Try installing rspec'
+  end
+end
+
+
+desc 'Run the server for clients to connect to'
+task :serve do
+  raise NotImplementedError.new('Server task not yet implimented!')
+end
+
+
+namespace :doc do
+  desc 'Create the YARD documentation for the project'
+  task :yard do
+    res = sh 'yard doc *.rb'
+    sh 'yard stats *.rb --list-undoc'
+  end
+
+  desc 'Create code coverage'
+  task :coverage do
+    Rake::Task[:test].invoke
+  end
+end
diff --git a/core/building.rb b/core/building.rb
new file mode 100644
index 0000000..e3924bb
--- /dev/null
+++ b/core/building.rb
@@ -0,0 +1,47 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require './space_object'
+
+
+# This class is for buildings that are built on a planet. Currently it
+# inherrits the SpaceObject class however it should probably inherrit a class
+# that is for planets.
+class Building<SpaceObject
+  attr_reader :name, :type
+
+  # Create a new building object. You can pass in a name and a type.
+  #
+  # @param player [Player] The player who owns this building
+  # @param name [String] The name of the building
+  # @param type [String] The type of the building
+  def initialize(player, planet, name: 'default name', type: 'Central Post')
+    super()
+    # Valiate type:
+    if not get_config['buildings'].include? type
+      raise BuildingError, "Invalid building type"
+    end
+    @player = player
+    @planet = planet
+    @name = name
+    @type = type
+  end
+
+  # Override the superclass tick method. This will add the resources that ar
+  # produced to the player and the planet that the building belongs to.
+  def tick
+    get_config['buildings'][@type]['produces'].each do |resource, value|
+      # Send some to the player (Global resoures)
+      if ['metal', 'credits', 'crystals'].include? resource
+        @player.resources[resource] += value
+      else
+        @planet.resources[resource] += value
+      end
+    end
+  end
+end
+
+
+# Error class for the buildings
+class BuildingError < StandardError
+end
diff --git a/core/config.yaml b/core/config.yaml
new file mode 100644
index 0000000..1b4f60e
--- /dev/null
+++ b/core/config.yaml
@@ -0,0 +1,183 @@
+# Configuration file for the game:
+
+planets:
+  production:
+    metal: 10
+    credits: 10
+    crystals: 10
+
+buildings:
+  Central Post:
+    description:
+      "The Central Post allows you to build other buildings on the planet"
+    cost:
+      metal: 100
+      credits: 100
+      crystals: 100
+    produces:
+      metal: 10
+      credits: 10
+      crystals: 10
+
+##### ENERGY PRODUCTION #####
+
+  Nuclear Plant:
+    description:
+      "The Nuclear Plant is expensive however it will produce a constant and large amount of energy"
+    cost:
+      metal: 500
+      credits: 500
+      crystals: 500
+    produces:
+      energy: 1000
+
+  Wind Farm:
+    description:
+      "A Wind Farm will produce a variable amount of energy depending on the surface of the planet."
+    cost:
+      metal: 200
+      credits: 200
+      crystals: 200
+    produces:
+      energy: 200
+
+  Solar Farm:
+    description:
+      "A Solar Farm will produce a variable amount of energy depending on the planet environment"
+    cost:
+      metal: 200
+      credits: 200
+      crystals: 200
+    produces:
+      energy: 200
+
+##### RESEARCH BUILDINGS #####
+
+  Civil Research:
+    description:
+      "Proviced access to research economic and morale upgrades"
+    cost:
+      metal: 1000
+      credits: 1000
+      crystals: 1000
+    produces:
+      civ research: 1000 # This is a *global* resource
+
+  Space Research:
+    description:
+      "Provides access to sensor/module and engine upgrades"
+    cost:
+      metal: 1000
+      credits: 1000
+      crystals: 1000
+    produces:
+      spa research: 1000 # This is a *global* resource
+
+  Military Research:
+    description:
+      "Provides access to weapon and shield upgrades"
+    cost:
+      metal: 1000
+      credits: 1000
+      crystals: 1000
+    produces:
+      mil research: 1000 # This is a *global* resource
+
+  Shipping Research:
+    description:
+      "Provides access to ship and efficiency upgrades"
+    cost:
+      metal: 1000
+      credits: 1000
+      crystals: 1000
+    produces:
+      shi research: 1000 # This is a *global* resource
+
+##### RESOURCE PRODUCTION BUILDINGS #####
+
+  Refinery:
+    description:
+      "Extracts fuel from the ground. Most effective on liquid type planets."
+    cost:
+      metal: 150
+      credits: 150
+      crystals: 150
+      energy: 100 # This is energy per tick
+    produces:
+      fuel: 20 # This is a *global* resource
+
+  Mine:
+    description:
+      "Extracts metal from the ground. Most effective on"
+    cost:
+      metal: 150
+      credits: 150
+      crystals: 150
+      energy: 100 # This is energy per tick
+    produces:
+      metal: 20 # This is a *global* resource
+
+  Harvester:
+    description:
+      "Extracts crystas from the surface. Most effective on"
+    cost:
+      metal: 150
+      credits: 150
+      crystals: 150
+      energy: 100 # This is energy per tick
+    produces:
+      crystals: 20 # This is a *global* resource
+
+  Trade Center:
+    description:
+      "Increases the number of credits earned on this planet. Most effective on"
+    cost:
+      metal: 150
+      credits: 150
+      crystals: 150
+      energy: 100 # This is energy per tick
+    produces:
+      credits: 20 # This is a *global* resource
+
+  Farm:
+    description:
+      "Produces food on this planet. Required to grow the population"
+    cost:
+      metal: 150
+      credits: 150
+      crystals: 150
+      energy: 100 # This is energy per tick
+    produces:
+      food: 1000
+
+##### STUFF PRODUCTION #####
+
+  Space Port:
+    description:
+      "Produces space ships"
+    cost:
+      metal: 500
+      credits: 500
+      crystals: 500
+    produces:
+      ship building power: 1000
+
+  Manufacturing Plant:
+    description:
+      "Produces modules and engines for ships"
+    cost:
+      metal: 500
+      credits: 500
+      crystals: 500
+    produces:
+      manufacturing power: 1000
+
+  Military Production:
+    description:
+      "Produces weapons and shields"
+    cost:
+      metal: 500
+      credits: 500
+      crystals: 500
+    produces:
+      military power: 1000
diff --git a/core/game.rb b/core/game.rb
new file mode 100644
index 0000000..8bc97b9
--- /dev/null
+++ b/core/game.rb
@@ -0,0 +1,133 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require 'securerandom'
+
+require './planet'
+
+# This class holds a game and should be the top level object.
+class Game
+  attr_reader :players, :width, :height, :planets, :game_id
+  # Create the game
+  def initialize(width: 0, height: 0, planets: 0, game_id: nil, name: 'default name')
+    @game_id = game_id || SecureRandom.hex
+    @game_name = name
+    @players = []
+    @planets = []
+    planets.times do |idx|
+      planet = Planet.new()
+      # Move to a random position
+      position = [rand(width), rand(height), 0]
+      # Ensure that the planets position is random
+      while @planets.map{ |pl| pl.position}.include? position
+        position = [rand(width), rand(height), 0]
+      end
+      planet.move(position)
+      # Add to the list:
+      @planets.append(planet)
+    end
+    @width = width
+    @height = height
+  end
+
+  # Add a player to the game
+  #
+  # @param player [Player] The player to add to the game
+  def add_player(player)
+    # Check if there is a planet free for the player:
+    avail_planets = []
+    @planets.each do |planet|
+      avail_planets.append(planet) if planet.owner.nil?
+    end
+    if avail_planets == []
+      raise GameError, "No available planets to add player to"
+    end
+    planet = avail_planets.sample
+
+    # Add the player to the game
+    @players.append(player)
+    planet.capture(player)
+    player.home_planet = planet
+  end
+
+  # Remove a player from the game
+  #
+  # @param player [Player] The player to be removed
+  def remove_player(player)
+    idx = @players.index(player)
+    if idx.nil?
+      # Raise an error that the player could not be found
+      raise GameError, 'Player not found to remove!'
+    end
+    @players.delete_at(idx)
+  end
+
+  # Checks if the given id matches a player in the game. Returns the player if
+  # so. otherwise raises an error.
+  #
+  # @param id [String] The id of a player
+  # @return Player The player matching the id
+  def check_id(id)
+    @players.each do |player|
+      if player.id == id
+        return player
+      end
+    end
+    raise GameError, 'Invalid player id!'
+  end
+
+  # Gets the planets for a player
+  #
+  # @param id [String] Players id
+  # @return [Array<Planet>] List of planets captured by that player
+  def get_captured_planets(id)
+    player = check_id(id)
+    result = []
+    @planets.each do |planet|
+      result.append(planet) if planet.owner == player
+    end
+    return result
+  end
+
+  # Returns a string representation of the map
+  # Begin no coverage
+  # :nocov:
+  def to_s()
+    # Create char map:
+    game_map = []
+    @height.times do
+      tmp = []
+      @width.times do
+        tmp.append('')
+      end
+      game_map.append(tmp)
+    end
+
+    # Add planets to the map:
+    @planets.each do |planet|
+      pos_x, pos_y, pos_z = planet.position
+      puts("x: #{pos_x}, y: #{pos_y}")
+      game_map[pos_y][pos_x] += 'p'
+    end
+
+    require 'pp'
+    pp(game_map)
+    game_map.each do |row|
+      row.each do |col|
+        if col == ''
+          print(' ')
+        else
+          print(col)
+        end
+      end
+      print("\n")
+    end
+  end
+  # :nocov:
+  # End no coverage
+
+end
+
+# General game errors
+class GameError<StandardError
+end
diff --git a/core/planet.rb b/core/planet.rb
new file mode 100644
index 0000000..39358ba
--- /dev/null
+++ b/core/planet.rb
@@ -0,0 +1,63 @@
+# Nathan Hinton 19 Dec 2025
+# Holds a planet and planet information
+
+require './space_object'
+
+# Class for planets.
+class Planet < SpaceObject
+  attr_reader :owner, :resources
+
+  # Create a planet in the game
+  def initialize()
+    super()
+    @buildings = []
+    @owner = nil
+    @resources = {
+      'food' => 0,
+      'energy' => 0,
+      'people' => 10
+    }
+
+  end
+
+  # Any clean up that the planet will need
+  def delete()
+  end
+
+  # Build a building on the planet
+  #
+  # @param building [Building] The building to be built
+  def building_build(building)
+    @buildings.append(building)
+  end
+
+  # Remove building from the planet
+  #
+  # @param building [Building] The building to be destroyed
+  def building_destroy(building)
+    index = @buildings.index(building)
+    if index == nil
+      raise PlanetError, 'Building not found to delete'
+    end
+    @buildings.delete_at(index)
+  end
+
+  # Capture a planet for a player
+  #
+  # @param player [Player] The player who is capturing the planet
+  def capture(player)
+    @buildings = [] # Destroy all the buildings on the planet
+    @owner = player
+  end
+
+  # Tick for the planet
+  def tick()
+    @buildings.each do |building|
+      building.tick
+    end
+  end
+end
+
+# Generic error for plannets
+class PlanetError < StandardError
+end
diff --git a/core/player.rb b/core/player.rb
new file mode 100644
index 0000000..4545477
--- /dev/null
+++ b/core/player.rb
@@ -0,0 +1,43 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require 'securerandom'
+
+# This defines the player class
+class Player
+  attr_reader :name, :resources, :id
+
+  attr_accessor :home_planet
+
+  # initialize a player.
+  #
+  # @param name [String] The name of the player
+  def initialize(name: 'test player')
+    @name = name
+    @planets = []
+    @fleets = []
+    @tech = []
+    @resources = {
+      'metal' => 0,
+      'crystals' => 0,
+      'credits' => 0
+    }
+    # This id will be used to validate the player in the game
+    @id = SecureRandom.hex()
+    @id_retrieved = false
+
+    @home_planet = nil
+  end
+
+  # Returns the player ID. This *should* only be called once. When called again
+  # it should print a warning to the log.
+  #
+  # @return [String] The ID of the player
+  def get_id
+    if @id_retrieved
+      # Print a warning message!
+    end
+    @id_retrieved = true
+    return @id
+  end
+end
diff --git a/core/readme.md b/core/readme.md
new file mode 100644
index 0000000..c544ffb
--- /dev/null
+++ b/core/readme.md
@@ -0,0 +1,6 @@
+# Core of game
+
+This will have the classes and a base loop however it will not do anything more
+than just store stuff I think.
+
+For now only the x and y cords are used.
diff --git a/core/server.rb b/core/server.rb
new file mode 100644
index 0000000..5a2366c
--- /dev/null
+++ b/core/server.rb
@@ -0,0 +1,55 @@
+# Nathan Hinton 19 Dec 2025
+# Runs the server for the game
+
+require 'sinatra'
+require 'sinatra/cross_origin'
+require 'json'
+
+require './game'
+
+configure do
+  enable :cross_origin
+end
+
+# CORS headers for all routes
+before do
+  headers 'Access-Control-Allow-Origin' => '*',  # Allow all domains (you can change '*' to a specific domain for security)
+          'Access-Control-Allow-Methods' => 'GET, POST, OPTIONS',  # Allow only specific methods
+          'Access-Control-Allow-Headers' => 'Content-Type, Authorization'
+end
+
+
+games = {}
+
+
+# Get the server status
+get '/status' do
+  return 'UP'
+end
+
+# Creates a new game
+#
+# @param name [String] Required. The name of the game
+# @param width [Integer] The width of the game space
+# @param height [Integer] The height of the game space
+# @param planets [Integer] The number of planets to have in the game
+get '/create_game' do
+  puts "Creating game named #{params['name']}"
+  name = params['name']
+  width = params['width'] || 10
+  width = width.to_i
+  height = params['height'] || 10
+  height = height.to_i
+  planets = params['planets'] || 20
+  planets = planets.to_i
+  games.update({name => Game.new(width: width, height: height, planets: planets, name: name)})
+  return 'OK'
+end
+
+
+# Gets games available
+#
+# @return [Array] list of game names
+get '/list_games' do
+  return games.keys.to_json
+end
diff --git a/core/space_object.rb b/core/space_object.rb
new file mode 100644
index 0000000..5f08ba8
--- /dev/null
+++ b/core/space_object.rb
@@ -0,0 +1,47 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require 'yaml'
+
+# Base class for any object in space. This can be a planet, asteroid, ship etc.
+class SpaceObject
+  attr_reader :position
+
+  File.open('./config.yaml', 'r') do |fi|
+    @@config = YAML.safe_load(fi.read())
+  end
+
+  # Create the object
+  #
+  def initialize()
+    @position = [0, 0, 0]
+  end
+
+  # Delete the object. This should be overwritten by the sub objects. For
+  # example when an asteroid is destroyed it might want to explode and damage
+  # anything nearby first before being removed from the game. This is the path
+  # that will be used for that.
+  def delete()
+  end
+
+  # Move the object to a new position. Not everything should be movable so this
+  # can be disallowed by sub classes.
+  #
+  # @param position [Array<Integer>] The position that the object should be
+  # moved to.
+  def move(position)
+    @position = position
+  end
+
+  # This *should* be overridden by any object that wants to do anyting. For
+  # example a ship probaly would like to move when the game tick happens.
+  def tick()
+  end
+
+  # Define a method to get the config
+  #
+  # @return [Hash] A hash containing the configuration
+  def get_config()
+    return @@config
+  end
+end
diff --git a/core/spec/building_spec.rb b/core/spec/building_spec.rb
new file mode 100644
index 0000000..d88cbe0
--- /dev/null
+++ b/core/spec/building_spec.rb
@@ -0,0 +1,74 @@
+# Nathan Hinton 19 Dec 2025
+
+# Defines tests for the buildings
+
+
+require './building'
+require './player'
+require './planet'
+require './space_object'
+
+RSpec.describe Building do
+  describe '#initialize' do
+    it 'Initializes to defaults' do
+      building = Building.new(Player.new(), Planet.new())
+      expect(building.name).to eq 'default name'
+      expect(building.type).to eq 'Central Post'
+    end
+
+    it 'initializes with custom values' do
+      building = Building.new(Player.new(), Planet.new(), name: 'nathan house', type: 'Solar Farm')
+      expect(building.name).to eq 'nathan house'
+      expect(building.type).to eq 'Solar Farm'
+    end
+
+    it 'will raise error when invalid building type' do
+      expect{Building.new(Player.new(), Planet.new(), name: 'error', type: 'error')}.to raise_error BuildingError, "Invalid building type"
+    end
+  end
+
+  describe '#tick' do
+    it 'Adds resources to the player' do
+      player = Player.new()
+      planet = Planet.new()
+      type = 'Central Post'
+      building = Building.new(player, planet, type: type)
+      config = SpaceObject.new().get_config
+      metal = config['buildings'][type]['produces']['metal']
+      credits = config['buildings'][type]['produces']['credits']
+      crystals = config['buildings'][type]['produces']['crystals']
+      expect(player.resources).to eq({'metal' => 0, 'crystals' => 0, 'credits' => 0})
+      expect{building.tick}.to_not raise_error
+      expect(player.resources).to eq({
+                                       'metal' => metal,
+                                       'crystals' => crystals,
+                                       'credits' => credits
+                                     })
+      expect(planet.resources).to eq({
+                                       'food' => 0,
+                                       'energy' => 0,
+                                       'people' => 10
+                                     })
+    end
+
+    it 'Adds resources to the planet' do
+      player = Player.new()
+      planet = Planet.new()
+      type = 'Nuclear Plant'
+      building = Building.new(player, planet, type: type)
+      config = SpaceObject.new().get_config
+      expect(player.resources).to eq({'metal' => 0, 'crystals' => 0, 'credits' => 0})
+      expect{building.tick}.to_not raise_error
+      expect(player.resources).to eq({
+                                       'metal' => 0,
+                                       'crystals' => 0,
+                                       'credits' => 0
+                                     })
+      expect(planet.resources).to eq({
+                                       'food' => 0,
+                                       'energy' => 1000,
+                                       'people' => 10
+                                     })
+    end
+  end
+end
diff --git a/core/spec/examples.txt b/core/spec/examples.txt
new file mode 100644
index 0000000..2878b6f
--- /dev/null
+++ b/core/spec/examples.txt
@@ -0,0 +1,34 @@
+example_id                         | status | run_time        |
+---------------------------------- | ------ | --------------- |
+./spec/building_spec.rb[1:1:1]     | passed | 0.00024 seconds |
+./spec/building_spec.rb[1:1:2]     | passed | 0.00044 seconds |
+./spec/building_spec.rb[1:1:3]     | passed | 0.00059 seconds |
+./spec/building_spec.rb[1:2:1]     | passed | 0.00024 seconds |
+./spec/building_spec.rb[1:2:2]     | passed | 0.00208 seconds |
+./spec/game_spec.rb[1:1:1]         | passed | 0.00011 seconds |
+./spec/game_spec.rb[1:1:2]         | passed | 0.00011 seconds |
+./spec/game_spec.rb[1:1:3]         | passed | 0.00011 seconds |
+./spec/game_spec.rb[1:1:4]         | passed | 0.00014 seconds |
+./spec/game_spec.rb[1:2:1]         | passed | 0.00014 seconds |
+./spec/game_spec.rb[1:2:2]         | passed | 0.00016 seconds |
+./spec/game_spec.rb[1:3:1]         | passed | 0.00019 seconds |
+./spec/game_spec.rb[1:3:2]         | passed | 0.00026 seconds |
+./spec/game_spec.rb[1:4:1]         | passed | 0.00013 seconds |
+./spec/game_spec.rb[1:4:2]         | passed | 0.00016 seconds |
+./spec/game_spec.rb[1:5:1]         | passed | 0.00016 seconds |
+./spec/planet_spec.rb[1:1:1]       | passed | 0.00018 seconds |
+./spec/planet_spec.rb[1:1:2]       | passed | 0.00013 seconds |
+./spec/planet_spec.rb[1:3:1]       | passed | 0.00015 seconds |
+./spec/planet_spec.rb[1:4:1]       | passed | 0.00018 seconds |
+./spec/planet_spec.rb[1:4:2]       | passed | 0.00021 seconds |
+./spec/planet_spec.rb[1:5:1]       | passed | 0.00168 seconds |
+./spec/planet_spec.rb[1:5:2]       | passed | 0.00039 seconds |
+./spec/planet_spec.rb[1:6:1]       | passed | 0.00873 seconds |
+./spec/player_spec.rb[1:1:1]       | passed | 0.00035 seconds |
+./spec/player_spec.rb[1:2:1]       | passed | 0.00052 seconds |
+./spec/player_spec.rb[1:2:2]       | passed | 0.00044 seconds |
+./spec/simple_game_spec.rb[1:1]    | passed | 0.00956 seconds |
+./spec/space_object_spec.rb[1:1:1] | passed | 0.00012 seconds |
+./spec/space_object_spec.rb[1:3:1] | passed | 0.00023 seconds |
+./spec/space_object_spec.rb[1:4:1] | passed | 0.00013 seconds |
+./spec/space_object_spec.rb[1:6:1] | passed | 0.00012 seconds |
diff --git a/core/spec/game_spec.rb b/core/spec/game_spec.rb
new file mode 100644
index 0000000..c182da9
--- /dev/null
+++ b/core/spec/game_spec.rb
@@ -0,0 +1,87 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require './game'
+require './player'
+
+RSpec.describe Game do
+  describe '#initialize' do
+    it 'Creates an empty list of players' do
+      expect(Game.new().players).to eq []
+    end
+
+    it 'sets the width when passed in' do
+      expect(Game.new(width: 10).width).to eq 10
+    end
+
+    it 'sets the height when passed in' do
+      expect(Game.new(height: 11).height).to eq 11
+    end
+
+    it 'creates the specified number of planets' do
+      expect(Game.new(planets: 5).planets.length).to eq 5
+    end
+  end
+
+
+  describe '#add_player' do
+    it 'adds a player to the game' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      expect(game.players).to eq [player]
+    end
+
+    it 'fails when there are no planets available for the player' do
+      game = Game.new(planets: 0)
+      player = Player.new()
+      expect{game.add_player(player)}.to raise_error GameError, "No available planets to add player to"
+      expect(game.players).to eq []
+    end
+  end
+
+
+  describe '#remove_player' do
+    it 'removes a player from the game' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      expect(game.players).to eq [player]
+      expect(game.remove_player(player)).to eq player
+      expect(game.players).to eq []
+    end
+
+    it 'returns an error when the player is not in the game' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      player2 = Player.new()
+      expect{game.remove_player(player2)}.to raise_error GameError, 'Player not found to remove!'
+    end
+  end
+
+  describe '#check_id' do
+    it 'returns true when the player id is valid for a player' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      expect(game.check_id(player.get_id)).to eq player
+    end
+
+    it 'returns false when the player id does not match a player' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      expect{game.check_id('a')}.to raise_error GameError, 'Invalid player id!'
+    end
+  end
+
+  describe '#get_captured_planets' do
+    it 'returns the captured planets of the player' do
+      game = Game.new(planets: 1)
+      player = Player.new()
+      game.add_player(player)
+      expect(game.get_captured_planets(player.get_id)).to eq game.instance_variable_get(:@planets)
+    end
+  end
+end
diff --git a/core/spec/planet_spec.rb b/core/spec/planet_spec.rb
new file mode 100644
index 0000000..3a0afde
--- /dev/null
+++ b/core/spec/planet_spec.rb
@@ -0,0 +1,95 @@
+# Nathan Hinton 19 Dec 2025
+#
+# Defines tests for the planets
+
+
+require './planet'
+require './building'
+
+RSpec.describe Planet do
+  describe '#initialize' do
+    it 'Starts in a position' do
+      expect(Planet.new().instance_variable_get(:@position)).to eq [0, 0, 0]
+    end
+
+    it 'Creates a buildings list' do
+      expect(Planet.new().instance_variable_get(:@buildings)).to eq []
+    end
+  end
+
+
+  describe '#delete' do
+  end
+
+
+  describe '#building_build' do
+    it 'Adds a building to the planet building list' do
+      planet = Planet.new()
+      test_building = Building.new(Player.new(), planet)
+      expect{planet.building_build(test_building)}.to_not raise_error
+      expect(planet.instance_variable_get(:@buildings)).to eq [test_building]
+    end
+  end
+
+
+  describe '#building_destroy' do
+    it 'removes a building from the list' do
+      planet = Planet.new()
+      test_building = Building.new(Player.new(), planet)
+      planet.building_build(test_building)
+      expect(planet.instance_variable_get(:@buildings)).to eq [test_building]
+      expect(planet.building_destroy(test_building)).to eq test_building
+      expect(planet.instance_variable_get(:@buildings)).to eq []
+    end
+
+    it 'raises an error if the building can not be removed' do
+      planet = Planet.new()
+      test_building = Building.new(Player.new(), planet)
+      planet.building_build(test_building)
+      test_building2 = Building.new(Player.new(), planet)
+      expect{planet.building_destroy(test_building2)}.to raise_error PlanetError, 'Building not found to delete'
+    end
+  end
+
+
+  describe '#capture' do
+    it 'sets the planet owner' do
+      planet = Planet.new()
+      player = Player.new(name: 'test0')
+      expect(planet.capture(player)).to be player
+      expect(planet.instance_variable_get(:@owner)).to be player
+    end
+
+    it 'removes all buildings from the planet' do
+      planet = Planet.new()
+      player = Player.new(name: 'test0')
+      planet.capture(player)
+      test_building = Building.new(player, planet)
+      planet.building_build(test_building)
+
+      player1 = Player.new(name: 'test1')
+      expect(planet.instance_variable_get(:@buildings)).to eq [test_building]
+      expect(planet.capture(player1)).to be player1
+      expect(planet.instance_variable_get(:@owner)).to be player1
+      expect(planet.instance_variable_get(:@buildings)).to eq []
+    end
+  end
+
+
+  describe '#tick' do
+    it 'Sends the tick event to all buildings on the planet' do
+      planet = Planet.new()
+      test_building1 = Building.new(Player.new(), planet)
+      test_building2 = Building.new(Player.new(), planet)
+      test_building3 = Building.new(Player.new(), planet)
+      planet.building_build(test_building1)
+      planet.building_build(test_building2)
+      planet.building_build(test_building3)
+
+      expect(test_building1).to receive(:tick)
+      expect(test_building2).to receive(:tick)
+      expect(test_building3).to receive(:tick)
+      expect(planet.tick).to eq planet.instance_variable_get(:@buildings)
+    end
+  end
+end
diff --git a/core/spec/player_spec.rb b/core/spec/player_spec.rb
new file mode 100644
index 0000000..fdc8310
--- /dev/null
+++ b/core/spec/player_spec.rb
@@ -0,0 +1,51 @@
+# Nathan Hinton 19 Dec 2025
+# Test file for the player class.
+
+
+require 'securerandom'
+
+require './player'
+
+RSpec.describe Player do
+  # Set the testing id
+  let(:id) { 'cfeab1a60864fd529cb9ce993e9c3af4' }
+
+  before(:each) do
+    # Make sure that we get the same ID every time.
+    allow(SecureRandom).to receive(:hex).and_return(id)
+  end
+
+  describe '#initialize' do
+    it 'initializes with name' do
+      expect(Player.new(name: 'Nathan').name).to eq 'Nathan'
+    end
+  end
+
+  describe '#get_id' do
+    it 'returns the id' do
+      player = Player.new()
+      expect(player.instance_variable_get(:@id_retrieved)).to be false
+      expect(player.get_id).to eq id
+      expect(player.instance_variable_get(:@id_retrieved)).to be true
+    end
+
+    it 'prints a warning when the id is gotten more than once' do
+      player = Player.new()
+      player.get_id
+      expect(player.instance_variable_get(:@id_retrieved)).to be true
+      expect(player.get_id).to eq id
+      expect(player.instance_variable_get(:@id_retrieved)).to be true
+    end
+  end
+
+  describe '#planets' do
+  end
+
+
+  describe '#fleets', pending: 'Ships not yet implimented' do
+  end
+
+
+  describe '#tech', pending: 'Tech not yet implimented' do
+  end
+end
diff --git a/core/spec/simple_game_spec.rb b/core/spec/simple_game_spec.rb
new file mode 100644
index 0000000..c53361a
--- /dev/null
+++ b/core/spec/simple_game_spec.rb
@@ -0,0 +1,23 @@
+# Nathan Hinton 19 Dec 2025
+
+
+require './player'
+require './game'
+
+
+# This tests a simple game.
+RSpec.describe 'Simple game', :sim => true do
+  it 'Initalize a new game and add a player' do
+    # Setup the player
+    player = Player.new()
+    id = player.get_id
+    expect(player.resources).to eq({'metal' => 0, 'crystals' => 0, 'galaxy credits' => 0})
+
+    # Setup the start planet
+    game = Game.new(width: 5, height: 5, planets: 5)
+    expect(game.planets.length).to eq 5
+    game.add_player(player)
+    expect(game.get_captured_planets(id).length).to eq 1
+    puts(game)
+  end
+end
diff --git a/core/spec/space_object_spec.rb b/core/spec/space_object_spec.rb
new file mode 100644
index 0000000..f2b82f2
--- /dev/null
+++ b/core/spec/space_object_spec.rb
@@ -0,0 +1,47 @@
+# Nathan Hinton 19 Dec 2025
+#
+# Defines tests for the space object class
+
+
+require './space_object'
+
+RSpec.describe SpaceObject do
+  describe '#initialize' do
+    it 'works with no args' do
+      expect(SpaceObject.new().instance_variable_get(:@position)).to eq [0, 0, 0]
+    end
+  end
+
+
+  describe '#delete' do
+  end
+
+
+  describe '#move' do
+    let(:so) { SpaceObject.new() }
+    it 'changes the objects position and returns the new position' do
+      expect(so.instance_variable_get(:@position)).to eq [0, 0, 0]
+      expect(so.move([2, 3, 4])).to eq [2, 3, 4]
+      expect(so.instance_variable_get(:@position)).to eq [2, 3, 4]
+    end
+  end
+
+
+  describe '#position' do
+    let(:so) { SpaceObject.new() }
+    it 'returns the current position' do
+      so.move([1, 2, 3])
+      expect(so.position).to eq [1, 2, 3]
+    end
+  end
+
+
+  describe '#tick' do
+  end
+
+  describe '#get_config' do
+    it 'returns the correct keys' do
+      expect(SpaceObject.new().get_config.keys).to eq ['planets', 'buildings']
+    end
+  end
+end
diff --git a/core/spec/spec_helper.rb b/core/spec/spec_helper.rb
new file mode 100644
index 0000000..47ee133
--- /dev/null
+++ b/core/spec/spec_helper.rb
@@ -0,0 +1,109 @@
+require 'simplecov'
+
+SimpleCov.configure do
+  coverage_dir 'coverage'
+
+  # Start SimpleCov
+  SimpleCov.start
+end
+
+
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+  # The settings below are suggested to provide a good initial experience
+  # with RSpec, but feel free to customize to your heart's content.
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+
+  # Exclude by default the simulate tests.
+  config.filter_run_excluding :sim => true
+end