Have you ever wondered how the original Super Mario Bros. would play if Mario had a Portal gun? Probably not. That said, once you hear the idea, it's instantly intriguing; once you see it in action, the genius of the concept is immediately apparent.
It's Mario, with a Portal gun. Epic.
If you'd like to get in on the shenanegans, there are (free) downloadable versions of the game for Windows, Linux, and MacOS up on the game's official site.
If the concept alone isn't enough to get your attention, check out the full feature list: