From the Super Mario Wiki
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World 19-3 is the third level of World 19 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS. It is exclusive to the Coursebot, and is based on Danger: Fire Bars! from Super Mario Maker.
The level consists of Hard Blocks with gaps in between and Fire Bars on tracks around them. In the middle of the level, the Hard Blocks are replaced by Note Blocks. The player also has to avoid Dry Bones and Red Koopa Troopas. To help the player out, there are two Super Mushrooms and a 1-Up Mushroom. One of the Super Mushrooms is in a ? Block.