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Puzzle Book With Pages That Must Be Solved to Unlock the Next

Some books are hard to read, but few are as difficult as the Codex Silenda. Why? Because it actually won't let you read it unless you're smart enough to unlock it.

Some books are hard to read, but few are as difficult as the Codex Silenda. Why? Because it actually won't let you read it unless you're smart enough to unlock it....