This is the old Wolf, Goat, Cabbage puzzle for the ZX81. I originally wanted to add a title screen the first time I updated the program. Finally got around to doing that.
JSZeddy, by Erik Olofsen based on JSSpeccy and Z81 emus.
For programs that don’t auto-run, press R then ENTER.
Also you may need to click on the applet to enable keyboard entry.