This is an iPhone game whose gameplay is based solely on accelerometer input. The player has no control over where he aims, moves, or faces. He simply rotates and tilts the iPhone to affect the trajector of his bullets. The "real world" gravity detected by the iPhone's accelerometer is applied to the in-game bullets.

Gravity Defender was created for the Game Design class at the Entertainment Technology Center. You may download a lengthy design process document for the game here.