The William Carter Puzzles are a set of puzzles hidden by Klei in update trailers for Don't Starve starting from the Underground update. In the trailers, there would often be hidden text (with some variation) or parts of hidden text that are not easy to spot in the video without closer inspection. The hidden text would lead to bit.ly links that reveal the backstory of Maxwell, whose original name was William Carter before the main events of the game's story. As the puzzles go on, Charlie is introduced as well.