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diff --git a/samples/09_performance/05_sprites_as_classes/app/main.rb b/samples/09_performance/05_sprites_as_classes/app/main.rb
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+++ b/samples/09_performance/05_sprites_as_classes/app/main.rb
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+# Sprites represented as Classes using the queue ~args.outputs.sprites~.
+# gives you full control of property declaration and method invocation.
+# They are more performant than OpenEntities and StrictEntities, but more code upfront.
+class Star
+  attr_sprite
+
+  def initialize grid
+    @grid = grid
+    @x = (rand @grid.w) * -1
+    @y = (rand @grid.h) * -1
+    @w    = 4
+    @h    = 4
+    @s    = 1 + (4.randomize :ratio)
+    @path = 'sprites/tiny-star.png'
+  end
+
+  def move
+    @x += @s
+    @y += @s
+    @x = (rand @grid.w) * -1 if @x > @grid.right
+    @y = (rand @grid.h) * -1 if @y > @grid.top
+  end
+end
+
+# calls methods needed for game to run properly
+def tick args
+  # sets console command when sample app initially opens
+  if Kernel.global_tick_count == 0
+    puts ""
+    puts ""
+    puts "========================================================="
+    puts "* INFO: Sprites, Classes"
+    puts "* INFO: Please specify the number of sprites to render."
+    args.gtk.console.set_command "reset_with count: 100"
+  end
+
+  # init
+  if args.state.tick_count == 0
+    args.state.stars = args.state.star_count.map { |i| Star.new args.grid }
+  end
+
+  # update
+  args.state.stars.each(&:move)
+
+  # render
+  args.outputs.sprites << args.state.stars
+  args.outputs.background_color = [0, 0, 0]
+  args.outputs.primitives << args.gtk.current_framerate_primitives
+end
+
+# resets game, and assigns star count given by user
+def reset_with count: count
+  $gtk.reset
+  $gtk.args.state.star_count = count
+end