Poor old Dorothy, the Giant Tortoise, has a Desert Thorn stuck in her. If you don't want to bother with the Desert Thorn, but you need a pointy object, you can get the Pointy Knife instead.
This is the low-spoiler guide for "Getting close to Dorothy." puzzle in Henry Mosse and the Wormhole Conspiracy. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.