Klax [NTSC Prototype]

Klax was the last Atari 2600 game to be developed and released. It was released so late in fact that it only made it out overseas in PAL format. Best Electronics uncovered nine NTSC prototypes that proved to be the final version. This proves that Atari was planning on releasing it in the US, but the crumbling 2600 market made them rethink their decision.