Super Mario 74 Extreme Edition is a really hard rom hack for Super Mario 64 (But no match for Simpleflips)
Super Mario 74 Extreme Edition is a harder version of Super Mario 74.
Simpleflips is doing a 100% playthrough because a long time ago Simpleflips made a lot of promises, one of them being that he was going to complete the game, but then he stopped streaming for awhile and therefore he never completed the game.