Sentinel is a very original wooden lock puzzle. It is actually a useable lock but in order to open it you must decipher the clues on the front and back of the lock.
A tricky puzzle to open but when you do there is also a small hidden compartment you can store a note in.
This is an interesting take on a lock puzzle and should be appreciated by all puzzlers.
Made from Maple in the US, Sentinel measures 127 x 76 x 38mm. The internal storage space is 25.4 x 15 x 15mm.
The solution is included.