Saving the Princess looks almost too easy armed with an Aperture Science Handheld Portal Device. But that doesn’t mean we’re not overly excited to play Mari0, a side-scrolling that jams Valve’s brand of teleportation into Nintendo’s NES classic.

Developers at the ominous sounding Stabyourself.net are responsible for Mari0, a mash-up of Super Mario Bros. and Portal, a real game that we’d previously seen as a Dorkly-produced joke video.

Mari0 is in the words of its creators, “an actual game being developed – it is not a mod of any existing one.” They say it will be released for free, along with its source code, and will support map packs in the future. Mari0 also promises Portal-infused levels from Super Mario Bros. and its sequel, which many of us know as Super Mario Bros. The Lost Levels.

It even has simultaneous multiplayer, just like Portal 2.