OSM is a new mod for Super Smash Bros. 3DS and Wii U. As this mod is open-source, the only limits are the community's imagination! Some things that have the potential to change include Characters, Gameplay, Stages, SFX and Music, Skins, and even more! If there's something not yet possible to edit, just let us know and we'll do our best to make it editable for you!

The Grand Unveiling! - 13/12/17

This is it, OSM! The Open-Source Smash 4 Mod. It may not suprise many of you, but this mod was born from USM-eM. When development really began slowing to a crawl, we decided something needed to be done, and open-sourcing was our solution... Read More!