On the secret map level Return to Peru, There is a secret room. After you get the large boulder to drop, Go back to the idol stand area (were the arrows would shoot at you out of the walls)and go through the right side tunnel where you met the scorpians when you first went through. Follow the tunnel and when you get to where the big boulder was, you can jump over and pick up some herbs. Off to the right there is a little entrance to a room with some buttons. The Puzzle is real easy to figure out. After you do, go in the room that opens and you can get 3 large med kits. Have Fun!