Book Creator | Secret Codes https://read.bookcreator.com/aWAhdfUWXPQR1UPW7fJOHnfObsb2/biJ1UGWASBmXqMq0Y0kp8Q/RolKWQPxQqiZzvIUfqfC_A
Try and solve the code yourself, and then make your own version. You could use Lego or even come up with your own secret code using shapes in Book Creator.
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