diff --git a/app/scene.rb b/app/scene.rb
index 53768ef..6f0b733 100644
--- a/app/scene.rb
+++ b/app/scene.rb
@@ -13,13 +13,9 @@ module Scene
     # changed to so any data is cleared out
     # ex:
     #   Scene.switch(args, :gameplay)
-    def switch(args, scene, reset: false, return_to: nil)
-      args.state.scene_to_return_to = return_to if return_to
-
-      if scene == :back && args.state.scene_to_return_to
-        scene = args.state.scene_to_return_to
-        args.state.scene_to_return_to = nil
-      end
+    def switch(args, scene, reset: false, push_or_pop: false)
+      # if we're here /not/ from push or pop, clear the scene stack
+      args.state.scene_stack.clear unless push_or_pop
 
       if reset
         args.state.send(scene)&.current_option_i = nil
@@ -30,7 +26,22 @@ module Scene
       end
 
       args.state.scene = scene
-      raise FinishTick.new
+      raise FinishTick, 'finish tick early'
+    end
+
+    # Change the current scene and push the previous scene onto the stack
+    def push(args, scene, reset: false)
+      puts "Pushing #{scene}"
+      args.state.scene_stack ||= []
+      args.state.scene_stack.push(args.state.scene)
+
+      switch(args, scene, reset: reset, push_or_pop: true)
+    end
+
+    # Return to the previous scene on the stack
+    def pop(args, reset: false)
+      scene = !args.state.scene_stack || args.state.scene_stack.empty? ? :back : args.state.scene_stack.pop
+      switch(args, scene, reset: reset, push_or_pop: true)
     end
   end
 end
diff --git a/app/scenes/cube_tube.rb b/app/scenes/cube_tube.rb
index bbbbeb6..819a59d 100644
--- a/app/scenes/cube_tube.rb
+++ b/app/scenes/cube_tube.rb
@@ -1,37 +1,33 @@
+# frozen_string_literal: true
+
+# Extension to the scene class for the cube tube scene
 module Scene
   class << self
     def tick_cube_tube(args)
+      # call the gameplay scene tick method (handles pause menu, etc)
       tick_gameplay(args)
-      args.state.game ||= BlockTubeGame.new args
+      args.state.game ||= CubeTubeGame.new args
       args.state.game.tick
     end
   end
 end
 
-
-class BlockTubeGame
+#
+class CubeTubeGame
   def initialize args
     @args = args
     
     @blocksize = 30
     @grid_w = 10
     @grid_h = 20
-    @grid_x = (720 - (@grid_w * @blocksize)) / 2
-    @grid_y = ((1280 - (@grid_h * @blocksize)) / 2) + 150
+    @grid_x = 115
+    @grid_y = ((1280 - (@grid_h * @blocksize)) / 2) + 143
+    @start_grid_x = @grid_x
+    @start_grid_y = @grid_y
+    @bg_x = 0
+    @bg_w = 1335
 
-    @next_piece_box = [-1, -9, 7, 7]
-
-    @color_index = [
-      [000, 000, 000],
-      [255, 000, 000],
-      [000, 255, 000],
-      [000, 000, 255],
-      [255, 255, 000],
-      [000, 255, 255],
-      [255, 000, 255],
-      [255, 127, 000],
-      [127, 127, 127],
-    ]
+    @next_piece_box = [2, -9.5, 7, 7]
 
     @sprite_index = [
       Sprite.for(:black),
@@ -61,12 +57,14 @@ class BlockTubeGame
     @lines_to_clear = []
     @line_clear_timer = 0
 
+    @music_queue = []
+
     reset_game
   end
 
   def reset_game
     @lines = 0
-    @level = 9
+    @level = 0
     @current_speed = get_speed
     @next_move = @current_speed
     @gameover = false
@@ -80,12 +78,16 @@ class BlockTubeGame
     @lines_to_clear = []
     @line_clear_timer = 0
 
-    for x in 0..@grid_w-1 do
+    @bg_x = 0
+
+    each 0..@grid_w - 1 do |x|
       @grid[x] = []
-      for y in 0..@grid_h-1 do
+      each 0..@grid_h - 1 do |y|
         @grid[x][y] = 0
       end
     end
+
+    @music_queue = [:music1, :music2]
   end
 
   def render_grid_border x, y, w, h, color
@@ -103,28 +105,54 @@ class BlockTubeGame
 
   def render_background
     # draw a solid black background
-    @args.outputs.solids  << [
+    @args.outputs.solids << [
       0,
       0,
       1280,
       1280,
-      *@color_index[0]
+      0, 0, 0
+    ]
+
+    @bg_x += (@level+1)*2 unless @gameover
+    if(@bg_x >= @bg_w) 
+      @bg_x %= @bg_w
+    end
+
+    @args.outputs.sprites << [@bg_x,0,@bg_w,720,Sprite.for(:tunnel)]
+    @args.outputs.sprites << [@bg_x-@bg_w,0,@bg_w,720,Sprite.for(:tunnel)]
+
+    @args.outputs.sprites  << [
+      0,
+      @grid_x - 64,
+      1597,
+      540,
+      Sprite.for(:train)
+    ]
+  end
+
+  def render_foreground
+    @args.outputs.sprites  << [
+      0,
+      @grid_x - 64,
+      1597,
+      540,
+      Sprite.for(:train_fore)
     ]
   end
 
   # x and y are positions in the grid, not pixels
   def render_block x, y, color
     @args.outputs.sprites << [
-      (1280 - @grid_y) - (y * @blocksize),
+      (1280 - @grid_y) - (y * @blocksize) - 6,
       @grid_x + (x * @blocksize),
-      @blocksize, @blocksize,
+      @blocksize + 6, @blocksize,
       @sprite_index[color]
     ]
   end
 
   def render_grid
 
-    render_grid_border -1, -1, @grid_w + 2, @grid_h + 2, 8
+    #render_grid_border -1, -1, @grid_w + 2, @grid_h + 2, 8
 
     for x in 0..@grid_w-1 do
       for y in 0..@grid_h-1 do
@@ -148,14 +176,41 @@ class BlockTubeGame
   end
 
   def render_next_piece
+
+    screen_x = @grid_y + 400
+    screen_y = @grid_x + 80
+    screen_w = 250
+    screen_h = 200
+
+    @args.outputs.sprites << [
+      screen_x, screen_y + 10, screen_w, screen_h + 10,
+      Sprite.for(:screen)
+    ]
+    
     next_piece = @line_clear_timer <= 0 ? @next_piece : @current_piece
-    render_grid_border *@next_piece_box, 8
+    # render_grid_border *@next_piece_box, 8
     centerx = (@next_piece_box[2] - next_piece.length) / 2
     centery = (@next_piece_box[3] - next_piece[0].length) / 2
 
     render_piece next_piece, @next_piece_box[0] + centerx, @next_piece_box[1] + centery
 
-    @args.outputs.labels << [ 892, 431, "Next piece", 10, 255, 255, 255, 255 ]
+    @args.outputs.labels << [screen_x + 33, screen_y + screen_h - 8, "Next piece", 8, 255, 255, 255, 255 ]
+
+    screen_s = case (@args.state.tick_count % 32)
+    when 0..7
+      :screen_s1
+    when 8..15
+      :screen_s2
+    when 16..23
+      :screen_s3
+    when 24..31
+      :screen_s4
+    end
+
+    @args.outputs.sprites << [
+      screen_x, screen_y + 10, screen_w, screen_h + 10,
+      Sprite.for(screen_s)
+    ]
   end
 
   def render_score
@@ -174,6 +229,7 @@ class BlockTubeGame
     render_next_piece
     render_current_piece
     render_grid
+    render_foreground
     render_score
     render_gameover if @showgameover
   end
@@ -245,17 +301,23 @@ class BlockTubeGame
       if full # no empty space in the row
         @lines_to_clear.push y
         @lines += 1
-        @level += 1 if (@lines%10).floor == 0
         @line_clear_timer = 70
+        if (@lines%10).floor == 0
+          @level += 1 
+          @args.audio[:music].looping = false
+        end
       end
     end
 
     select_next_piece
     if @lines_to_clear.empty?
+      play_sfx(@args, :drop)
       if current_piece_colliding
         @gameover = true
+        stop_music(@args)
       end
     else
+      play_sfx(@args, :clear)
       @current_speed = get_speed
     end
 
@@ -283,6 +345,7 @@ class BlockTubeGame
   end
 
   def rotate_current_piece_left
+    play_sfx(@args, :rotate)
     @current_piece = @current_piece.transpose.map(&:reverse)
     if(@current_piece_x + @current_piece.length) >= @grid_w
       @current_piece_x = @grid_w - @current_piece.length
@@ -290,6 +353,7 @@ class BlockTubeGame
   end
 
   def rotate_current_piece_right
+    play_sfx(@args, :rotate)
     @current_piece = @current_piece.transpose.map(&:reverse)
     @current_piece = @current_piece.transpose.map(&:reverse)
     @current_piece = @current_piece.transpose.map(&:reverse)
@@ -330,9 +394,18 @@ class BlockTubeGame
       return
     end
 
-    if @line_clear_timer > 0
+    if @args.audio[:music]
+      resume_music(@args) if @args.audio[:music].paused
+      @args.audio[:music].pitch = 1 + (@level * 0.125)
+    else
+      music = @music_queue.shift
+      @music_queue.push music
+      play_music(@args, music)
+    end
+
+    if @line_clear_timer.positive?
       @line_clear_timer -= 1
-      if @line_clear_timer == 0
+      if @line_clear_timer.zero?
         for y in @lines_to_clear
           for i in y.downto(1) do
             for j in 0..@grid_w-1
@@ -343,6 +416,7 @@ class BlockTubeGame
             @grid[i][0] = 0
           end
         end
+        play_sfx(@args, :drop)
         @lines_to_clear = []
       end
       return
@@ -352,21 +426,35 @@ class BlockTubeGame
       if @current_piece_x > 0
         @current_piece_x -= 1
         if current_piece_colliding
+          play_sfx(@args, :move_deny)
           @current_piece_x += 1
+        else
+          play_sfx(@args, :move)
         end
+      else
+        play_sfx(@args, :move_deny)
       end
     end
     if k.key_down.up || k.key_down.w || c.key_down.up
       if (@current_piece_x + @current_piece.length) < @grid_w
         @current_piece_x += 1
         if current_piece_colliding
+          play_sfx(@args, :move_deny)
           @current_piece_x -= 1
+        else
+          play_sfx(@args, :move)
         end
+      else
+        play_sfx(@args, :move_deny)
       end
     end
     if k.key_down.left || k.key_held.left || k.key_down.a || k.key_held.a || c.key_down.left || c.key_held.left
       @next_move -= @current_speed / 3
     end
+    if k.key_down.plus || k.key_down.equal_sign
+      @level += 1
+      @current_speed = get_speed
+    end
 
     if k.key_down.q || c.key_down.a
       rotate_current_piece_left
@@ -375,6 +463,13 @@ class BlockTubeGame
       rotate_current_piece_right
     end
 
+    case @args.state.tick_count % (@current_speed * 6)
+    when 0..3, (@current_speed * 2)..((@current_speed * 2) + 3)
+      @grid_x = @start_grid_x + 3
+    else
+      @grid_x = @start_grid_x
+    end
+
     @next_move -= 1
     if @next_move <= 0
       @next_move = @current_speed
diff --git a/app/scenes/gameplay.rb b/app/scenes/gameplay.rb
index 8dec146..5eea3a7 100644
--- a/app/scenes/gameplay.rb
+++ b/app/scenes/gameplay.rb
@@ -28,7 +28,7 @@ module Scene
 
     def pause(args)
       play_sfx(args, :select)
-      return Scene.switch(args, :paused, reset: true)
+      return Scene.push(args, :paused, reset: true)
     end
 
     def tick_pause_button(args, sprites)
diff --git a/app/scenes/main_menu.rb b/app/scenes/main_menu.rb
index 929581f..5cddb5d 100644
--- a/app/scenes/main_menu.rb
+++ b/app/scenes/main_menu.rb
@@ -10,7 +10,7 @@ module Scene
         },
         {
           key: :settings,
-          on_select: -> (args) { Scene.switch(args, :settings, reset: true, return_to: :main_menu) }
+          on_select: -> (args) { Scene.push(args, :settings, reset: true) }
         },
       ]
 
diff --git a/app/scenes/paused.rb b/app/scenes/paused.rb
index 4f712b5..814f861 100644
--- a/app/scenes/paused.rb
+++ b/app/scenes/paused.rb
@@ -7,11 +7,11 @@ module Scene
       options = [
         {
           key: :resume,
-          on_select: -> (args) { Scene.switch(args, :gameplay) }
+          on_select: -> (args) { Scene.pop(args) }
         },
         {
           key: :settings,
-          on_select: -> (args) { Scene.switch(args, :settings, reset: true, return_to: :paused) }
+          on_select: -> (args) { Scene.push(args, :settings, reset: true) }
         },
         {
           key: :return_to_main_menu,
@@ -28,9 +28,14 @@ module Scene
 
       Menu.tick(args, :paused, options)
 
+      if args.audio[:music] && !args.audio[:music].paused
+        pause_music(args)
+      end
+
       if secondary_down?(args.inputs)
         play_sfx(args, :select)
         options.find { |o| o[:key] == :resume }[:on_select].call(args)
+        
       end
 
       args.outputs.labels << label(:paused, x: args.grid.w / 2, y: args.grid.top - 200, align: ALIGN_CENTER, size: SIZE_LG, font: FONT_BOLD)
diff --git a/app/scenes/settings.rb b/app/scenes/settings.rb
index 5ff9775..8a13c44 100644
--- a/app/scenes/settings.rb
+++ b/app/scenes/settings.rb
@@ -29,7 +29,7 @@ module Scene
         },
         {
           key: :back,
-          on_select: -> (args) { Scene.switch(args, :back) }
+          on_select: -> (args) { Scene.pop(args) }
         },
       ]
 
diff --git a/app/sound.rb b/app/sound.rb
index e0f5673..f565f1b 100644
--- a/app/sound.rb
+++ b/app/sound.rb
@@ -28,3 +28,8 @@ end
 def resume_music(args)
   args.audio[:music].paused = false
 end
+
+# stop the currently playing music track
+def stop_music(args)
+  args.audio.delete(:music)
+end
\ No newline at end of file
diff --git a/app/sprite.rb b/app/sprite.rb
index 7304bde..5c1fb2e 100644
--- a/app/sprite.rb
+++ b/app/sprite.rb
@@ -2,24 +2,25 @@ module Sprite
   # annoying to track but useful for reloading with +i+ in debug mode; would be
   # nice to define a different way
   SPRITES = {
-    bullet: 'sprites/bullet.png',
-    enemy: 'sprites/enemy.png',
-    enemy_king: 'sprites/enemy_king.png',
-    enemy_super: 'sprites/enemy_super.png',
-    exp_chip: 'sprites/exp_chip.png',
-    familiar: 'sprites/familiar.png',
-    player: 'sprites/player.png',
+    train: 'sprites/train-1.png',
+    train_fore: 'sprites/train-2.png',
+    screen: 'sprites/screen.png',
+    screen_s1: 'sprites/screen-s1.png',
+    screen_s2: 'sprites/screen-s2.png',
+    screen_s3: 'sprites/screen-s3.png',
+    screen_s4: 'sprites/screen-s4.png',
+    tunnel: 'sprites/tunnel.png',
     pause: 'sprites/pause.png',
-    gray: 'sprites/square/gray.png',
-    black: 'sprites/square/black.png',
-    white: 'sprites/square/white.png',
-    red: 'sprites/square/red.png',
-    green: 'sprites/square/green.png',
-    blue: 'sprites/square/blue.png',
-    yellow: 'sprites/square/yellow.png',
-    indigo: 'sprites/square/indigo.png',
-    violet: 'sprites/square/violet.png',
-    orange: 'sprites/square/orange.png'
+    gray: 'sprites/box/gray.png',
+    black: 'sprites/box/black.png',
+    white: 'sprites/box/white.png',
+    red: 'sprites/box/red.png',
+    green: 'sprites/box/green.png',
+    blue: 'sprites/box/blue.png',
+    yellow: 'sprites/box/yellow.png',
+    indigo: 'sprites/box/indigo.png',
+    violet: 'sprites/box/violet.png',
+    orange: 'sprites/box/orange.png'
   }
 
   class << self
diff --git a/app/tick.rb b/app/tick.rb
index 3fc51f4..80ef8b8 100644
--- a/app/tick.rb
+++ b/app/tick.rb
@@ -11,7 +11,7 @@ def tick(args)
   args.outputs.background_color = TRUE_BLACK.values
 
   args.state.has_focus ||= true
-  args.state.scene ||= :main_menu
+  Scene.push(args, :main_menu, reset: true) if !args.state.scene
 
   track_swipe(args) if mobile?
 
diff --git a/sounds/clear.wav b/sounds/clear.wav
new file mode 100644
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diff --git a/sounds/drop.wav b/sounds/drop.wav
new file mode 100644
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diff --git a/sounds/menu.wav b/sounds/menu.wav
index 46b19b7..a4a48cb 100644
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diff --git a/sounds/move.wav b/sounds/move.wav
new file mode 100644
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diff --git a/sounds/move_deny.wav b/sounds/move_deny.wav
new file mode 100644
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diff --git a/sounds/music1.ogg b/sounds/music1.ogg
new file mode 100644
index 0000000..ab5679e
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diff --git a/sounds/music2.ogg b/sounds/music2.ogg
new file mode 100644
index 0000000..44e8574
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diff --git a/sounds/rotate.wav b/sounds/rotate.wav
new file mode 100644
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diff --git a/sounds/select.wav b/sounds/select.wav
index 748bbf5..23863e0 100644
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diff --git a/sprites/box/black.png b/sprites/box/black.png
new file mode 100644
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diff --git a/sprites/box/blue.png b/sprites/box/blue.png
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diff --git a/sprites/box/green.png b/sprites/box/green.png
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new file mode 100644
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diff --git a/sprites/box/orange.png b/sprites/box/orange.png
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diff --git a/sprites/box/red.png b/sprites/box/red.png
new file mode 100644
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diff --git a/sprites/box/white.png b/sprites/box/white.png
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diff --git a/sprites/box/yellow.png b/sprites/box/yellow.png
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diff --git a/sprites/screen-s1.png b/sprites/screen-s1.png
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diff --git a/sprites/screen-s2.png b/sprites/screen-s2.png
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diff --git a/sprites/screen-s4.png b/sprites/screen-s4.png
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diff --git a/sprites/screen.png b/sprites/screen.png
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diff --git a/sprites/train-1.png b/sprites/train-1.png
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diff --git a/sprites/tunnel.png b/sprites/tunnel.png
new file mode 100644
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