I just created a variant of Zombie in my Pocket that is called Robot in my Pocket. It is a free print-n-play one player game that takes you through RoboRally trying to upload a virus to disable the super-computers and save the other robots.
I had the idea that in large games of RoboRally when a player is eliminated they can play a quick game of Robot in my Pocket to try to defeat the computers and thereby win. Or you could just have fun playing it when you can't find others to play with or only have about 10 minutes to play a game.
(I use small nuts for markers on the player aid and a large nut to mark you position.)