I was at goodwill and purchased a atari 2600 system along with a bunch of games. There was a game in there that I have never seen before called "Looping" Everywhere I have checked, it says that it was never released and a prototype. It looks like a regular cartridge with a normal label ect ect, but I was wondering about these prototypes for atari. I know nintendo ones have generic labels with no graphics, but this cart looks like a normal cart. Does anyone have any info on atari prototypes if they were made with normal labels? Any Idea how much this thing is worth? Thanks Alot!