World 8-Bowser's Castle (New Super Mario Bros.)
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This level takes place in Bowser's Castle. Mario must first enter the door in the first room. If he hits the ? Switch from one of the blocks, the will turn room upside-down. In the next room, there are several Burners. After going through the door at the very right of it, Mario will arrive in a room with a Thwomp. After turning the room upside-down and entering the door, Mario will be in the Burner room again, but this time with the entire room upside-down. After going through the now-accessible door, the player will end up in the room where they will have to avoid the Thwomps and spikes. After turning this room upside-down, they will have to enter the door at the top of the area. In the next room, the player will have two doors to choose from, and the difference between both is that the left door will take Mario to the Star Coin and the right door will not. The player must go through the door at the top from the door chosen before, and Mario will reach the Checkpoint Flag. Mario will have to take the correct paths to make it to the end. At the end of the room is the final door, where Mario will battle Bowser and Bowser Jr. to save Princess Peach.