[thackerhacker]

I played this a lot (on Atari ST - one mouse / one joystick - the mouser definitely had an advantage).

The most amazing thing about it was how you could successfully set traps for your opponent even though they were looking at the same screen but a few inches to the left or right.

Nothing better than them working so hard on getting over some obstacle only to scroll back to the beginning and see most of their lemmings disappearing into a big hole in the ground.