Last one for tonight...
Since Halo 2600 was allowed on the list, I'll put this:
58. Star Castle
It's actually an old arcade game, and it exists on Vectrex, but this particular cartridge was made last year by an old atari employee, and was
kickstarter exclusive as far as I know. The cartridge freaking flashes when there's sound in the game, it's badass... And the game is fun/crazy hard.