Robot City

Robot City is an 8K unreleased prototype on the Odyssey 2, and Thomas has thus far managed to squeeze it into 2K on the 2600. The premise of the game is very simple: You're a helicopter in a maze filled with tanks trying to kill you. Of course, you must kill them first with your gun. But the tanks have a shield and can only be disabled when hit in the rear where they are unprotected. There are two mazes in this version, which you can switch between by using the Select switch.