To solve the riddles, you need to think out of the box.
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If you’ve never done a puzzle book like this before, I would recommend that you pick up Tachyon first. It’s basically the exact same kind of book, but with a tighter theme and tighter puzzles. If you get through that and are dying for more puzzle book action, then Journal 29 is worth picking up, just expect a bit more frustration than the former.