Most racing games these days use high-powered racing cars or souped-up street cars. In fact, until Real Racing came along, one of the most popular iDevice racing games was Need for Speed. Well, while ATVs aren't exactly urban or illegal, they do get their chance to shine through their muddy exteriors in Dirt Moto Racing, where tracks are far off in the wilderness and entirely lacking both police and crazed fans.
Dirt Moto Racing is definitely a full-featured game. It has eight tours with four races in each, along with four different types of race, plus two extra types in the single events mode. The entire game is essentially locked when you first go into it, so you have to race in the career mode extensively in order to make the single events mode enjoyable.