If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Extreme biking is very popular not only in the U.S., but also in a lot of other countries. Devilish Moto Trial is an extreme biking contest where the best bikers of the world are taking part. Drive your bike through an obstacle course and try not to crash.
Arrow keys - To drive.
Space bar - Nitro.