Death Rally

One of the first game that I played on iPhone. It cost around 0.99 $, but believe it is worth of buying.

Single player mode is good to get known the tracks and to get use to weapons and driving at the same time. After 1-2 hours of playing you are ready to go to multi player mode - here the fun really starts!

Almost forgot. There are number of additional gadgets (e.g. weapons, nitro) that you can get , if you smash boxes that are on the track. 

Very fun game!