The Teamwork Hub Kingdom Tree House is the royal tree house located in the Royal Gardens of the Teamwork Hub Kingdom Castle. It was mentioned and made it's first appearance in Zombie Gas!.
The tree house is built to look like a castle and a tree house with spiral stairs, staircases, balconies, bridges, and spires. It also has lifts for carrying people and animals or any kind of stuff (food, drinks, toys, etc.) to bring inside the tree house, a swing, and a pulley which is connected to the window of Lief's bedroom so he and his friends can go from his room to there.
In the series Edit
In Zombie Gas!, Lief tells the Hub Squad that they need to get to the tree house to be safe from the zombies and make a plan to save everyone from the zombie fog.