If you accept the spirit of the keyword rather than the letter, here is your safe, 100% legal guide:
Super Mario 2D Universe is a popular fan-developed platformer for PC that reimagines the classic Mario formula with high-definition assets and expansive new worlds. Unlike official Nintendo releases, this project is built by the community—specifically using the Super Mario Bros. X (SMBX) super mario 2d universe download pc exclusive
Super Mario 2D Universe is a fan-made project that seeks to combine the tight physics of classic Super Mario World with the graphical polish and mechanics of the modern "New Super Mario Bros" era. If you accept the spirit of the keyword