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Acting effectively as a major romhack, but in the form of a fork of the Super Mario 64 decompilation PC port, Super Mario 64 Plus adds all sorts of fun features, like being able to collect multiple Stars in a level, giving Mario new mobility moves from Sunshine and Odyseey, more camera and draw distance options, tons of small tweaks, and modes like daredevil or permadeath, with the latter option erasing all your progress and save file if you ever die.
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