Do you have enough concentration to shut the lock in difficult combinations? How difficult locks can you shut? Try it and prove your iron concentration!
Play the single player and see how good you are compared to other players.
With the multiplayer you can play with friends directly on one device, make decision based on who can shut faster the locks! :o)
Challenge friends and check leaderboards and achievements.
With Family Sharing set up, up to six family members can use this app.