Cogwalk

Cogwalk is a puzzle about writing one program for a crew of robots. Three instructions: step, turn left, turn right. Put them on the strip, press GO, and every robot runs the whole thing at once. They face different ways, so an instruction that helps one can wreck another. A robot walking into a wall just stands there, and stalling one on purpose while the rest keep going is how most levels get solved. Fifty of them, with ice, turntables and a third robot later on.