Prop a Codex Silenda up on your coffee table and it’s sure to attract attention. Not only is this tome thick as hell, it’s also made of laser-cut wood and boasts only five pages. But each of the five features an intricate puzzle that needs to be overcome to unlock the next page and keep progressing. Puzzles include the Mechanical Iris, a Rotating Maze, Geneva Gears, Paradox Sliders, and the Cryptex Lock, all more complex than the run-of-the-mill puzzles in the mainstream like Rubik’s cubes and one trick ponies in the form of interlocked pieces. The only catch is they’re all out of hand-assembled options so you’ll need to build it yourself — or get someone to build it for you, since you’ll probably want a go at it yourself. Unlocking the last page also grants access to a small storage stash, useful once you’ve mastered all five.