(There's no video for Zippy yet. Please contribute to MR and add a video now!)
Zippy is an automata sandbox where a worm moves by itself and bumps into "pucks" (squares) along its way. When the automated worm bumps into one, that puck pushes back 1 unit and the worm turns 90 degrees and continues forward. You can place pucks by clicking anywhere on the screen or by pulling the menu at the top and selecting "Add 10 random pucks" which will distribute them randomly on the screen. You can adjust the speed at which the worm moves.
Zippy.sit (14.01 KiB / 14.34 KB)
Zippy / compressed w/ Stuffit
Mac OS 1.x - Mac OS 9.2.2
Emulating this? It should run fine under: Mini vMac