Vintage Tandy Radio Shack TRS-80 Color Computer Game "Color Cubes" (a speed cube game, similar to a Rubik's Cube).  Requires a Coco 1, 2, or 3.  Not sure what the system requirements are on this one probably minimum 16k?  Tested this year on my Coco 3, it is in working order.  This cartridge is used and may show wear, please examine photos carefully.  I have specifically noted some label wear (some spoting/discoloration, creasing, rub wear, missing portions, etc), a number painted on the spine, and some typical rub wear on the plastics.  Will guarantee against DOA.  Cartridge only (no manual or box, etc).  I have other Coco Games in my other listings, will combine on shipping if you purchase more than one.