New answers tagged nes
6
Community Wiki, as it's unclear to me why @JaapJorisVens deleted his answer given that it appears to contain the necessary clues:
The carts are special carts we have made that contain 1000 selectable games. It is worth mentioning that the carts are actually adapters - essentially Game Genies - which do nothing unless you have an original NES Tetris cart ...
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