Marble Madness is hands-down one of the all-time classic arcade games. Rolling Madness is a clone of Marble Madness, done using OpenGL and other open source tools. It looks great, and plays perfectly. The author appears to have used the same music and sounds from the original game. I can almost hear that pocketful of quarters jingling. One of the neat features in Rolling Madness is that you can switch from a true perspective (possible with today's machines), as you see in the screenshot here, or you can use the old perspective from the original, which was really an isometric view. Either way, hours of ball rolling is yours to be had. I tried using the keyboard controls, but the mouse is a nice change of pace. The only negative is that it's Windows only.