One of the most unusual and rarest games produced for the Atari 2600, in 1983, was Space invaders inspired Pepsi Invaders or otherwise known as Coke Wins! Coca-Cola commissioned Atari to create the game, which was essentially a direct redesign of the Space Invaders ROM. Instead of aliens coming down the screen, they had the word PEPSI.
Only 125 cartridges were produced, which were packaged unlabelled in plain white disposable packaging, and handed out to delegates at a Coca-Cola convention in Atlanta, along with a Atari 2600 console. When original copies do come up for sale, they can fetch up to $2000 at auction.
Due to the rarity and highly collectable nature of Pepsi Invaders, recently retro gaming enthusiasts have reproduced cartridges of the game, and gone as far as designing retro-style packaging, as it could have looked if the game had ever been commercially sold.