John and you have been close friends since your childhood. You both love the company of each other so much that not a day has passed without the two of you spending hours together. Lately, there have been reports of kidnappings taking place in the locality and unfortunately John has become the next victim of the kidnappers. They have kept him in a cave in the nearby forest. Nothing could have stopped you from going there to rescue the buddy but those crooks have used four locks to lock him up. They have hidden the keys in the forest before leaving for another kidnap mission. Find all the keys and rescue the boy before those kidnappers return.