Super Mario Worker Project (SMWP) is an unofficial Mario level editor based on Softendo’s Mario Worker 1.1.
It enhances and expands upon MW 1.1 by introducing new elements and fixing various bugs, while preserving its original physics behavior and level format structure.

SMWP website: https://smwp.marioforever.net/

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Disclaimer

Mario and its related copyrights belong to Nintendo.
Mario Worker, Super Mario Worker Project and INNOVATION LEAP are not affiliated with Nintendo in any way.
Super Mario Worker Project is a non-profit fan project and generates no revenue.
SMWP is freeware and is completely free of charge. If you paid for this game, you were ripped off!