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World 18-3 is the third level of World 18 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS.
The player starts out in an empty room with just a Warp Pipe. Taking this Pipe, the player ends up in a two-story room separated by One-Way Walls with a Trampoline on the up path and two Donut Blocks on the down path. On the bottom floor is a Pipe that spits Shoe Goombas then two Burners and a ? Block containing a Super Mushroom. On the top floor, there is a group of Boo Buddies protecting a ? Block holding a Key, another ? Block that is holding a P-Switch, Lifts that go to the Key Door and a Warp Pipe above coins. If the player takes the Warp Pipe, they can get a Big Stiletto Shoe from across an area of Munchers and Spike Traps. If the player takes the Key Door, they end up in a short area with coins followed by a tall area with Lifts with a Red Koopa Troopa on one of them and a Warp Pipe at the top. Two red Bill Blaster on the right shot Bull's Eye Bills at the player. However, if the player takes them out with the Big Stiletto Shoe, the can go into a Warp Door and collect lots of coins as well as a Super Mushroom before going through two Warp Pipes back to the Koopa Troopa area. Taking the Warp Pipe at the top of the Koopa Troopa area takes the player to a boss fight against a Big Bowser Jr on Trampolines with Super Mushrooms from the Pipe they came from. After defeating him, the player can receive a Checkpoint Flag.
After taking a Flimsy Lift to the top due to tracks, the player needs to ride a Fast Lava Lift to collect five Pink Coins while avoiding Stretches on Spike Traps. If the player fails to get all the Pink Coins, they can run to the Warp Door on the other side and go back to the top. After collecting all five Pink Coins, the player fights a Magikoopa in an area of Note Blocks and Trampolines with a Super Mushroom coming out of a Pipe. After defeating the Magikoopa, the player is taken to an area where they can take another Warp Pipe. This Warp Pipe takes the player to a fight against three Magikoopas in an area of Hard Blocks surrounding most ? Blocks, but only one has the Key. The player can choose two different paths signified by the contents of the nearby ? Blocks. The bottom path has a Super Star, but the player must get past many Cannons while running against Conveyor Belts, but can get a Super Mushroom from a ? Block at the end. The top path has a Super Mushroom and leads to an area of many coins and Conveyor Belts helping the player out. At the end of both paths is a Warp Pipe with One-Way Walls preventing the player from going the other path. Taking the final Warp Pipe, the player must get past two Magikoopas as well as a big one and a Cannon while not letting the Monty Moles above from being free from their Hard Block prisons. After the big Magikoopa is the Goal Pole, as well as a 1-Up Mushroom on a track on the other side.