If extreme sports and extreme challenges are you thing then you should play the Xtreme Hill Racer action sports game.  In this uphill rush racing game you need to speed your motorcycle across the track.  Collect bonus points as you race.  But most importantly when you hit the jumps you need to catch some big air and do as many tricks and flips as you can before you land.  You will earn bonus points for getting huge air and doing lots of flips but make sure you land your bike safely so you can continue racing.