1.5 — Mariones

As for the legality? Nintendo’s legal team has already issued three DMCA takedowns against the ROM’s distribution. But like the wind in World 7-2, you can't stop a good secret from spreading.

Thanks to a recent ROM dump from a corroded, hand-labeled EPROM chip found inside a former Nintendo of America employee’s storage unit, the emulation and modding community is buzzing over something unprecedented: MarioNES 1.5

As of press time, a second EPROM has been found labeled "MarioNES 2.0 - Zelda Crossover Prototype." We are not making this up. As for the legality