Dufus (in Timber) is a reference to Rufus from Deponia series. There are guides for all of the four Deponia games here in Nice Game Hints.
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Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "Dufus?" in Leisure Suit Larry - Wet Dreams Don't Dry. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.