A mod for Super Mario 64
SM64 Sapphire is a ROM hack made by Nebula. It was released around the tail end of 2017, it contains 6 levels, 1 secret level and has 30 stars.
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Not built to SM64's strengths. I dislike the structure of the game's worlds, which feel more like hub and spoke designs than proper 3d levels with multiple routes through them. About 3/5 stars are decent to good, but the remaining 2/5 are rough. Super Mario 64 is at its worst with tight turns and small platforms.