From the Super Mario Wiki, the Mario encyclopedia
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World 13-6 is the sixth and last level of World 13 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS. It is based on Don't Delay! from Super Mario Maker. However, before and while climbing the Vine, the player must avoid Burners and a Grinder. After this, there is a Checkpoint Flag and a ? Block containing a Super Mushroom. Instead of the Warp Door taking the player to Bowser, it takes the player to a hallway, where they must avoid Fire Bars early and Grinders later. At the end of the hallway is a door that will lead to Big Bowser. There is a ? Block to the right of the exit door to Bowser which contains a Fire Flower.