Zombies is a Robots-like game (video), with walls and without teleports.

https://bytebucket.org/grandpas/zombies/raw/afc398a073d4146a20ce67c4cb12c00c7410cafb/zombies.gif

The design and interface are clear, everything is shown on screen. You have to trick zombies to hit the walls and that will kill them, which isn’t hard since they are mindless. Once every zombie paints the wall with their mindless brains, you clear the level and move on to have more zombies.

robots is almost three or four decades old, that probably is the reason this game is conceptually simple, but yet fun to play if you need to kill time.

Zombies was created by Simon Burge in 1994, written in C with ncurses under the Simplified BSD License (2-clause), currently hg-afc398a073d4 (2015-11-18, post v1.0 (1999-06-26)).

Who needs teleportation when you get brain-crashing walls.