diff --git a/.ruby-version b/.ruby-version
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--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.0.1
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
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--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,5 @@
+source 'https://rubygems.org'
+
+ruby '~> 3.0'
+
+gem 'minigl', '~> 2.3.9'
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..d0a1671
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,18 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    gosu (1.4.1)
+    minigl (2.3.9)
+      gosu (>= 0.11, < 2.0)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  minigl (~> 2.3.9)
+
+RUBY VERSION
+   ruby 3.0.1p64
+
+BUNDLED WITH
+   2.2.15
diff --git a/data/img/interface/button.png b/data/img/interface/button.png
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diff --git a/data/img/interface/confirmDialog.png b/data/img/interface/confirmDialog.png
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diff --git a/data/img/interface/keyCursor.png b/data/img/interface/keyCursor.png
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diff --git a/data/img/interface/lineConverterCursor.png b/data/img/interface/lineConverterCursor.png
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diff --git a/src/button.rb b/src/button.rb
new file mode 100644
index 0000000..8425948
--- /dev/null
+++ b/src/button.rb
@@ -0,0 +1,19 @@
+require 'minigl'
+
+class Button < MiniGL::Button
+  def initialize(x, y, text, back = false, &action)
+    super(x: x, y: y, img: :interface_button)
+    @_text = text
+    @action = lambda do |_|
+      action&.call
+      Game.play_sound(back ? :backButtonClick : :buttonClick)
+    end
+    @text_helper = MiniGL::TextHelper.new(Game.font)
+  end
+
+  def draw
+    super
+
+    @text_helper.write_line(@_text, @text_x, @text_y - Game.font.height / 2, :center, 0xffffff, 255, :border, 0x006666, 2, 127)
+  end
+end
diff --git a/src/constants.rb b/src/constants.rb
new file mode 100644
index 0000000..2ee4d59
--- /dev/null
+++ b/src/constants.rb
@@ -0,0 +1,2 @@
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 600
diff --git a/src/game.rb b/src/game.rb
new file mode 100644
index 0000000..b922d69
--- /dev/null
+++ b/src/game.rb
@@ -0,0 +1,33 @@
+require_relative 'menu'
+
+class Game
+  class << self
+    attr_reader :font
+
+    def initialize
+      @music_volume = 10
+      @sound_volume = 10
+      @font = Res.font(:arialRounded, 24)
+      @controller = Menu.new
+    end
+
+    def play_song(id)
+      song = Res.song(id)
+      Gosu::Song.current_song&.stop unless Gosu::Song.current_song == song
+      song.volume = @music_volume * 0.1
+      song.play(true)
+    end
+
+    def play_sound(id)
+      Res.sound(id).play(@sound_volume * 0.1)
+    end
+
+    def update
+      @controller.update
+    end
+
+    def draw
+      @controller.draw
+    end
+  end
+end
diff --git a/src/main.rb b/src/main.rb
new file mode 100644
index 0000000..0c8f60a
--- /dev/null
+++ b/src/main.rb
@@ -0,0 +1,30 @@
+require 'minigl'
+require_relative 'constants'
+require_relative 'game'
+
+include MiniGL
+
+class Window < GameWindow
+  def initialize
+    super(SCREEN_WIDTH, SCREEN_HEIGHT, false)
+    self.caption = 'Spheres'
+    Res.prefix = File.expand_path(__FILE__).split('/')[0..-3].join('/') + '/data'
+    Game.initialize
+  end
+
+  def needs_cursor?
+    true
+  end
+
+  def update
+    KB.update
+    Mouse.update
+    Game.update
+  end
+
+  def draw
+    Game.draw
+  end
+end
+
+Window.new.show
diff --git a/src/menu.rb b/src/menu.rb
new file mode 100644
index 0000000..ee3bd94
--- /dev/null
+++ b/src/menu.rb
@@ -0,0 +1,31 @@
+require_relative 'button'
+
+class Menu
+  def initialize
+    @bg = Res.img(:other_bgStart)
+
+    @buttons = {
+      main: [
+        Button.new(305, 240, 'Play'),
+        Button.new(305, 290, 'Instructions'),
+        Button.new(305, 340, 'Options'),
+        Button.new(305, 390, 'High Scores'),
+        Button.new(305, 480, 'Exit') do
+          exit
+        end,
+      ]
+    }
+
+    @state = :main
+    Game.play_song(:spheresTheme)
+  end
+
+  def update
+    @buttons[@state]&.each(&:update)
+  end
+
+  def draw
+    @bg.draw(0, 0, 0)
+    @buttons[@state]&.each(&:draw)
+  end
+end