You design the bike and control the throttle, shifting and steering to race against other players, computer controlled bikes, and previous high scores. Registered users can create tracks of any shape including huge jumps, hill climbs, motocross, trials courses, or anything else you can imagine. Motocross riders love this game for it's riding realism. I am using Kagi to handle my registrations. All available versions of Dirt Bike can be downloaded below.
Some versions use opengl to take advantage of graphics accelerators.
You can get Mac OpenGL from Apple . If you are running OS X or have carbon libraries in OS 8 or OS 9, give it a try. Download it here. Here For the Mac version of Motorbike, Click Here . Note that Motorbike doesn't run properly on today's fast macs.