From the Super Mario Wiki, the Mario encyclopedia
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World 19-9 is the ninth of World 19 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. It is exclusive to the Coursebot.
The first section has Goombas and a Green Koopa Troopa bounce on Trampolines, with Goombas from Pipes using Sideways Trampolines not long after coming out of the Pipe. The player can go onto Mushroom Platforms where Red Koopa Troopas are. There is also a ? Block near the beginning containing a Super Mushroom. At the end of the section is a Warp Pipe and a wall to prevent the player from going any further. Taking the Warp Pipe leads to a platforming section with stacked Sideways Trampolines, one on a track, while most are on Hard Blocks on tracks. After this is a Checkpoint Flag and a ? Block containing a Super Mushroom on a Fire Flower. The player then needs to cross pits with Sideways Trampolines, which enemies use to cross the pit. At the end is a Warp Door and a Big Green Koopa Troopa. However, the Big Koopa Troopa is trapped inside the ground, and the only way to defeat it is to precisely throw a Koopa Troopa shell onto a Trampoline, and let it bounce up Sideways Trampolines to defeat him. After taking the Warp Door, the player lands on Sideways Trampolines on top of a Hard Block on tracks. It starts out with two, but grows due to Sideways Trampolines on Donut Blocks. This is repeated, but with less Sideways Trampolines and a Red Koopa Paratroopa. At the end is the Warp Pipe and a Big Goomba also trapped inside ground. But, to defeat him, the player must throw a Koopa Troopa shell into a tiny gap in the wall and have it bounce to the Big Goomba with the Trampoline. Back in the main area, the player needs to grab the Goal Pole while avoiding Goombas coming out of a Pipe and bouncing on Sideways Trampolines.