Go to Joyridin', select the Desert level, and a military vehicle. From where you start, drive over the hills where you see the windmills Go over the hills and you will see a road. Follow the road towards the border check point. Follow the road as it passes the post office and a couple of backpackers. Follow the road until it ends and take a right. Drive through the dried up pond until you see a tunnel. Drive through the tunnel and you will end up in a "valley". Follow the dirt tracks until you get to another tunnel but do not go into it. Instead, take a right up a steep hill. Once you are at the top, go under the boulders and follow the road that leads to a "pit". Drive off into the pit and you will see a tunnel. Drive through the tunnel and you will end up in another "pit". Drive into the pit and you will notice another tunnel. You can go into the tunnel and take a serious dive right over the post office that you passed on your way here or you can stay in the "pit". This is where you can climb the side to get to the "top" of the desert mountains. Use a car that is strong, such as the Hummer to get to the top. Once you are up there you will notice a black wall. That is the end of the map. There are a lot of traps up there, so be careful.