Hello, 3D World!
From the Super Mario Wiki, the Mario encyclopedia
Hello, 3D World! is the third course in the Story Mode of Super Mario Maker 2. It is set in the ground theme for the main area and the underground theme for the sub-area, as well as in the Super Mario 3D World style. It is posted by Lonely Farmer, and has a difficulty rating of 1/4 stars. Completing this course on Story Mode awards Mario with 100 Coins.
The level begins with a Stingby and a Piranha Plant further down. Another Stingby appears next to a Tree containing a Super Mushroom, along with a Goomba just ahead and a Big Piranha Plant next to a tree containing a Super Bell. The path splits from here; Mario can either head left to break some Brick Blocks to enter a Warp Pipe featuring an underground section with Big Goombas, or continue on the main path, which features a Big Piranha Plant guarding a 10-Coin. Both paths lead to the Checkpoint Flag, where Mario must navigate more Piranha Plants via an ! Block, then climb a Tree leading to yet another ! Block right next to a 30-Coin and some more Stingbies. After a brief slope, one more ! Block appears just before the Goal Pole.
"I've planted all these cute Trees in my garden. Would someone try reaching the goal by climbing Trees with ↑? I haven't weeded the garden in a while, but if the Piranha Plants give you trouble, just stomp them into the dirt."
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