Uphill Rush is one of the most successful casual gaming brands on the planet. The 2D stunt sims, which provide a series of obstacle-laden courses to whiz over on skateboards, motor bikes and other vehicles, have been played by millions online – in the summer, Uphill Rush 2 surpassed 150m unique game plays, and was being access 400,000 times a day. The first two games have now attracted something like 400m plays.

Like the Xbox 360 favourite Trials HD, the appeal is in the nicely tuned physics engine that gives you intricate control over the speed and angle of the vehicle as it ploughs over the ramps and loops. It's also weirdly hilarious to see your rider land face-first on the asphalt after having attempted an Evel Knievel-like trick fest.

Today, publisher SPIL Games has released Uphill Rush 3, with a slick new front-end, impressive environments and a whole host of new tracks. This time you can compete on a horse or even a cow (both of which have to be unlocked as you progress through the cup competitions) as well as the more conventional motor bike, inline skates and skateboard.

The circuits are typically well-designed, with alternate bonus-packed routes for skilled players, and there are even customisation options to personalise your bike and rider (one outfit looks like Solid Snake, which is rather cool). It's a pretty impressive showcase for the improving capabilities of Flash as a games platform.

Anyway, we like it so much we've embedded the game below, so take a look and prepare to waste quite a substantial part of your day trying to unlock a stunt cow.