Captain Toad made his Nintendo Switch debut with Captain Toad: Treasure Tracker last year. The fun title received additional downloadable content earlier this year. YouTuber Skelux has now discovered that there’s a number of unused levels hidden within the game’s files. Some of these maps are basically unfinished maps which Nintendo didn’t want to pursue. There are also puzzles built for a special E3 demo and a few levels which were presumably used for beta testing. Skelux has also discovered that the Wii U exclusive Super Mario 3D World levels are hidden away too.