Always remember that you should not drink and drive. Especially not a dirt bike on a rugged terrain. The up arrow is for moving on a rugged terrain, the down arrow is for brake, left arrow to lean back and the right arrow to lean in front.
This game is a game teaching you a lesson. The moral teaching is explicit here. You must try to follow this piece of advice while driving. The graphics of this game are very well devised. It is a pleasure playing this game of drunk rider.