Super Mario 3D Land was the first title to truly justify the 3DS’s stereoscopic 3D feature, using it not just for visual depth but as a core gameplay mechanic to help players judge jumps and navigate optical illusions.
If you aren't playing on original hardware, modern emulators can often run the game with enhanced visuals.
The game famously brought back the Tanooki Suit from Super Mario Bros. 3 , allowing Mario to hover and tail-whip through levels.