It's really hard to describe..... um, the track buildy bits reminded me a bit of a much better Motorcross madness.... as for the race bits, there's 3 types - the snowy one requires no brakes and involved screaming along the bare edges of big raised roads in a 4x4. The desert thing is basically an american 'powercar', so you have to break to take turns, and the thing bounces like mad(which is ace). And the rally bit puts you in charge of a mini which goes about mach 1.... it's insanely fast.
Basically, it's break neck arcade racing (albeit only against yourself - i.e. time trials)... reminds me a bit of a speeded up mario kart time trial corssed with Top Gear Rally on the N64.
But in all honesty, it is literally impossible to give a description.... best advice is try the demo, albeit the car they give you handles nowhere near as well (i.e. fun) as it's equivalent in the game.
