Zero Hour

Zero Hour is a mashup of game genres. It's a platform game with a few puzzle elements and a sense of adventure thrown in. Your mission is to infiltrate the site at ground zero, avoid the surveillance robots and disable the security sensors on each of the 12 levels to gain access to level 13 where you must disarm the nuclear bomb before the countdown timer expires. Written specifically and exclusively for the Tandy Color Computer 3, the game is designed for a standard 6809 CPU but will utilize a 6309 CPU if it detects it to provide an approximate 10% speed boost. (Source: official web site)