Fish

Fish (at least that's what the file was called) is an entirely unknown game that was discovered in a programmers personal folder on a backup tape from one of the old Atari mainframes. That alone makes for an interesting story, but the more cryptic part is that this was the Atari Coin-Op division's mainframe, not the Consumer Engineering Division's mainframe which was the one used by the Atari 2600 programmers. Why this game was on the Coin-Op mainframe is anyone's guess, but it may be that Coin-Op programmer Mike Albaugh was playing around with some 2600 programming in his spare time (he wouldn't be the first Coin-Op programmer to do this). Another explanation is that the real programmer sent the game to Mike for his feedback.

Mysterious origins aside, what exactly is Fish? Fish is a cute little action game where you control the titular fish in an effort to eat everything in sight. You can move the fish up and down around the screen and also swim forward or backwards which makes the fish move in a little 'chugging' motion like he's actually swimming. At first you'll only see worms moving back and forth across the screen. These worms are completely defenseless and can be eaten without worry.

However after a level or two the game will begin to introduce new elements including eggs, power balls, enemy fish, large enemy fish, large worms, and even squids