Our peg-leg friend is now on top of the hill...
He is looking at some symbols on the stone, beneath them somethings that looks like crystals...
He is not sure what to make of it... nor am I... but with a quick look on
http://pirates.playmobil.com I figured it out....
In front of the huge stone door, you'll find a switch... you need to turn this on...
..and the stone wall opens...
..you'll find a difficulty level switch behind the door... set it to difficulty three...
..close the door and press the gold button on the symbol cavern above the door...
...a combination pattern will light up, depending on the difficulty level, since I placed the switch to three, three symbols will light up...
..Then you have to find the coins with the three symbols...
...and place them on the missing symbol insertion point in front of the door, in the sequence of the light up crystals...
Each time you place the correct coin on the insertion point a mystical light lights up behind the door, and a jungle noise is heard...
..Until all the coins are in place and the door opens with a loud sound and a mystical noise...
...for our pirates to get hold of the treasure!!!