It was a sort of video game first, though:

> https://en.wikipedia.org/wiki/Steins;Gate

To be more specific, it was a visual novel -- which is like a reading-heavy/gameplay-light RPG. Equal parts book and game. (The nearest mainstream western equivalent would be something like Planescape: Torment.)

The anime adaptation, while good, didn't come close to capturing everything.

Super Mario Bros. is a movie [0].

[0] https://en.wikipedia.org/wiki/The_Super_Mario_Bros._Movie