The lights are on
This isn't the gateway into the Mushroom Kingdom, but it's just about the next best thing. Enter a world where you can discuss all things Mario and never feel out of place for wearing red overalls.
My favorite is Mario & Luigi: Bowser's inside story. I also love Paper Mario: The Thousand Year Door, as well as Super Mario Galaxy and Super Mario Bros. 3. The GBA remake.
Super Mario Galaxy 2 is my favorite game of all time.