Bug
Level 17 challenge - Grant cannot be helped - cannot receive the puzzle piece
Update
A new version was released, Version: 1.0.9, which fixes the above issue. Please uninstall the game and then redownload it from the game page to get the latest version!
Note: You will not lose your game progress by uninstalling the game!
Walkthrough
For general gameplay help, you can find the official walkthrough here!