Super Mario Bros. 3 has been out for 25 years and we still keep finding new ways to break it. Poleovermania puts on a master class in tool-assisted Mario 3 trickery and shows off dozens of the game’s lesser-known bugs. When I play the game, I can only do some of these tricks, usually by accident.

Source: マリオ3小ネタ集 – YouTube (Mario 3 Clip Collection), マリオ3小ネタ集2 – YouTube (Mario 3 Clip Collection 2), and マリオ3無限1UP集 – YouTube (Mario 3 Infinite 1UP Collection) via the name of a song by desk that he wrote for a Marvel vs. Capcom 3 bug video