Most important third party game on a Nintendo system (and why)

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firebush03 said:

Tetris is thrid-party, right? If so then I’d go with that. The game was a huge contributors to GameBoy’s success, launching Nintendo into their dominant position over the handheld market.

Technically the GB version was developed by Nintendo IIRC

https://en.wikipedia.org/wiki/Tetris_(Game_Boy_video_game)