Skelux, a Youtube channel dedicated to unearthing secrets in video games, has put out a video of unused levels in Captain Toad: Treasure Tracker.
Leftovers and more
In the video, we take a look at the levels that Nintendo left unused in Captain Toad: Treasure Tracker. It seems that the number of levels left unused are nearly half of all of the game’s levels.
A few were essentially complete, whereas others were primarily used for debug purposes. We also know that the cut levels from the Wii U version still exist in the Nintendo Switch release of the game, though they are obviously inaccessible under normal circumstances.
