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World 17-8 is the eighth and last level of World 17 of Super Mario Challenge from Super Mario Maker for Nintendo 3DS.
The level starts out with a Yoshi hatching from his Egg and a Lava Bubble on a track, leading to a Bob-omb surrounded by Hard Blocks. After the Bob-omb explodes, if the player jumps to where the Bob-omb was, they hit a Hidden Block containing a Super Mushroom or a Fire Flower, depending on their current power-up. In the next area, there is another Bob-omb surrounded by Hard Blocks, but this has a Fire Piranha Plant and a Big Venus Fire Trap above and a long row of Spike Traps below. After this are three Bob-ombs surrounded by Hard Blocks with three Bill Blasters to the left that shoot Zigzag Lava Bubbles. There is also an opening at the top guarded by a Big Piranha Plant. Below are Spike Traps and a Note Block to get back above the bridge from below. On the bottom right of the area, there is a Warp Pipe that gives Yoshi Eggs and a One-Way Wall blocking anyone going further right on this path. Above the Pipe is a Conveyor Belt used to get Yoshi to Lifts, which bring him to an area that Mario must wall jump to. Above the Lifts, there is a ? Block containing a 1-Up Mushroom. To the left are nine Bob-ombs surrounded by Hard Block, a Burner, and three Grinders on tracks, with the latter being used to go through the area without destroying any Bob-ombs. Below is a Conveyor Belt which takes the player back to the Pipe. On the right, however, are four regular sized Dry Bones, followed by five Big Dry Bones. The next area has three bridges that the player must travel right, left, right on, along with seven winged Hammer Bros., two Fire Bars, and a Bob-omb surrounded by Hard Blocks, which guards several coins and a ? Block containing a Super Star. After getting past the Hammer Bros., there is a hallway leading to a battle against Bowser with three Fire Bars in front of him. The Axe is on the other side of Bowser.