Vektrax

Vektrax is a 3D gravity racer game where the player is put in control of a spaceship racing down a tube, tilting the iPhone to control the steering. The player must race from checkpoint to checkpoint before their time runs out with the track twisting, splitting, and even unfolding and folding make in on itself (so the player is racing along the outside, not the inside).

The ship is equipped with an automatically (but slowly) regenerating shield which absorbs laser shots and even the occasional head-on collision with the other enemy craft also racing down the track. The player must shoot the enemies to gain fuel which can be used boost the ship faster (or to upgrade the ship's weapons to a quad-shot spray). The game goes on for as long as the player has time left on the clock, and comes with 3 difficulty levels to play at.