The Riddle of the Engineer's Guild

""Is it a child's toy or a triumph of the past? With a huff, and a puff, it stalled with gasp!""

- Professor Backpack

The Riddle of the Engineer's Guild is a Side Quest in Mario + Rabbids Sparks of Hope, located on the planet Terra Flora, specifically inside the Everbloom Tree. It is one of the five riddles on the planets. The Quest giver is Professor Backpack.

While the heroes are exploring the Everbloom Tree, they can find a side path leading to a room filled with stage props of Terra Flora, all colored. A model of the Wiggler Train is seen in the middle of the room, with nine pushable blocks all in the room, each one having part of a track. This is where the riddle is, along with Professor Backpack, who is struggling on the riddle.

To solve the riddle, the heroes need to push all of the blocks to the correct locations to make the track go full circle. Some blocks are trapped in some areas, along with ones that are in the wrong place. Some of these blocks are in set positions, and cannot be moved at all. The heroes must activate switches and Giant blocks using Beep-0's Wave Power to change the bridges to reach different areas of the room, along with unlocking gates to travel throughout the room.

Once all of the blocks have been moved to their correct positions, the riddle is solved, and the Wiggler Train model will loop around the track. The heroes are then awarded with a Planet Coin, and a treasure chest appears containing a Star Potion. Professor Backpack then thanks the heroes for helping him solve the riddle.