Hidden Block

'''Invisible ? Blocks (also called Invisible Blocks or Hidden Blocks''') are ? Blocks that are invisible to players unless they hit the block. Invisible ? Blocks first appeared after the fourth pipe in World 1-1 in Super Mario Bros., which contained a 1-Up Mushroom. Invisible ? Blocks did not have an appearance as when hit, they turned into Used Blocks. In Super Mario Maker, Invisible Blocks were given a sprite for when they were invisible, and was a regular ? Block with a grey pallet.