Description:
Super Mario Bros. Plus is an improvement to the original game which has the co-op hack by Corpse Grinder and Ti, Mario Maker 2 inspired palettes, modernized mushrooms, and fixed sprites. Patching this on a vanilla SMB rom first will not do anything, so you will need to patch this on a co-op hack rom instead. That hack can be found here: https://www.romhacking.net/hacks/4180/
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