Zero Gear is one of the best options of games to play casually with lots of friends. You can't exactly say it's a racing game because it is a lot more, you can race, play soccer, play tag, play pachinko, play basketball, hockey, a weird game where you punch other players in a precipice. Yeah, the usual stuff. Oh, and you can do all that with a completely customized car, in fact, you can customize it the way you want, no need to pucharse anything.
The game is really awesome to play with friends, don't even consider playing alone, bots suck and online community is dead, only buy this if you have friends. Zero Gear is full of OMG moments, it is simply incredible to play and provides lots of fun. The game don't try to be realistic, it takes a Mario Kart style aproach with items and stuff. I like the game a lot, my friends also do. Recomended.