Puzzle "Doorknob with eyes" is a decorated plywood case. 
The handle is made of solid wood with a metal rod inside. 
The "eyes" of this puzzle are gas-discharge indicators that show numbers. 
Players need to insert a game card (RFID technology), as a result of which they will receive a hint in the form of numbers. 
At your request, we can program any combination of numbers. The numbers show looped while the card is inserted into the puzzle. 
Puzzle has built-in sound effects.
Overall size of the puzzle case: 44-19-21cm
In the puzzle set, we give 5 cards