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World 18-1 is the first level of World 18 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS. This level is one of four levels that has a Castle in the sub area, but not the main area. This is the only one to have the main area be Underground.
The level starts out in a cave-like area. There are three ? Blocks nearby. The last one of these contains a Super Mushroom, which goes to the first Fire Koopa Clown Car. The area gets wider, but still cave-like, as many Bloopers of various types try to stop the player. There are Spike Traps and ground platforms in the middle to stop the player from going that way. Finally, there are several coins which make pictures of Bloopers and Blooper Nannies, two of which have Fire Flowers on tracks. At the end of the area is a Warp Pipe to the subarea. After a short drop, the player can get a Checkpoint Flag. After getting another Fire Koopa Clown car from a Pipe, the player needs to get past three Thwomps above Brick Blocks while destroying six Hard Blocks on tracks. After getting a Fire Flower on tracks, the player needs to get past a hallway of winged Spinies. After the hallway, four big winged Blooper Nannies, as well as a Fire Flower, can be found in Fire Koopa Clown Cars. This is followed by a wall of Hard Blocks with Rocky Wrenches inside. After getting past the wall, Sledge Bros., big winged Bowser Jr., a Super Mushroom, a 1-Up Mushroom, and a group of Big Boo Buddies, all in Fire Koopa Clown Cars, are in a wide area. After going through another Warp Pipe, the player is near the Goal Pole surrounded by four coins in Fire Koopa Clown Cars.