The fall is safe. The save is not. Pip Pop has found the best world ever. Sky Islands has clouds, balloons, fans, floating platforms, and falls that pop everyone back to the start. At first, the resets are hilarious. Then the tools start landing in the wrong islands. Then Captain remembers a conversation no one else had. Then Moss Guard disappears into a save fragment that looks almost, but not quite, like home. To bring the team back together, Pip has to learn that fun is strongest when it protects the people sharing it. He has to carry Anchor Block across a fragmented sky. He has to make the joke finish. And he has to do it before the world stops remembering where his friends went. Book Four of The Gadget Sandbox Chronicles. For readers ages 10 and up who love a joke that finishes. Includes a complete Sandbox Glossary covering Sky Islands' NPCs, the wind pattern, anchor blocks, the Crystal Key as merge key, and Rule Four.