If you are going to get through this game be prepared for LOTS of repetition - youll get better (I CAN do that without traction control!) or youll learn tricks (if I turn right for just a sec before I go left I can make that turn on turbo) or youll find shortcuts (who knew buses could do THAT?) or youll discover secrets (turbo isnt ALWAYS faster). Then youll want re-run individual vehicles and whole levels because you can save a second or a few tenths of a second. And once you save a few seconds at one level youll want to re-run every higher level so the savings shows up on those levels, too. Before you know it, weeks will have gone by.
Either that, or youll be ready to throw your iPad or iPhone in frustration after 30 minutes.
The game is hard, partly because of the way you steer the vehicles. But its also hard because its got a lot of depth. Think youve found the optimal solution to a vehicle or a level? Think again. Im ranked in the top five in every level (not counting cheaters) and after playing this game for hours every day for a year Im _still_ learning new things and finding new ways to be faster.
Love it or hate it, its not for everyone. But its definitely one of the deepest, most challenging games in the App Store. Give it a try!