CANYON! is a game where you have to manoeuvre your ship down the center of an endlessly scrolling, gradually narrowing track without touching the sides. The canyon walls scroll upward (following the natural scrolling direction of the PET), so you feel like you are flying downwards. The game is far too easy on anything other than the fastest speed, and even then, it feels too easy.
Joystick control is an option for this game. CANYON! also features sound, but as far as I can tell, the only sound that plays is when you crash your ship.