1... 2... 3... KICK IT! (Drop That Beat Like an Ugly Baby) -- Battle your favorite drum 'n' bass track, or relax as you fly through that trance album. "Kick It" takes your MP3 music and creates floating worlds for you to fight through.
Skyboxes paint a 3D scene's background elements -- the backgroundiest background layer. For Aaaaa!, it's static images of cities or planets or what is essentially "infinitely far away" from the player's standpoint: