Voidlock is an interesting lock puzzle from Jean-Claude Constantin.
This is the wooden version and the aim is to open the lock but there is no key. You must move the metal slider and pull the wooden mechanism in the correct sequence to unlock. In total this requires more than 300 moves.
Available in both wooden and metal versions, this is the wooden.
The puzzle measures 105 x 70 x 30mm.
Please note the solution is not included.