A free program for Android, by Alcyone.

Mountain Bike is an exciting, 2D action Bicycle driving game based on real physics with cute graphics and parallax scrolling. You can drive your mountain bike through paths and hurdles and over beautiful hills and mountains. You can also do stunts while powering through the game’s 30 challenging level.

You can go uphill or downhill on glaciers in the mountains and dangerous slopes with obstacles like tree trunks and rocks. You can also go through the snowy terrain and technical terrain. There are no limits to what you can do in this game.