Go to the Ruigrijk area. Head right to the ship, represented by the ship wheel. In front of the ship are two long beams with planks scattered over the area. These planks are always in the same position. Grab the planks one by one and place them in the area between the two beams. Once all planks are placed, a walkway has formed that allows Pardoes to move to the ship.

Once on the ship, click on the doorknob on the right side of the screen. This will open the door and allow you to grab the box of matches. With the matches in your inventory, move back and go to the Anderrijk area.

From the main Anderrijk area, go left to the decrepit castle. Click on the tombstones in front of the castle to move them. When the tombstones are in the correct positions (at the moment this is complete guesswork), Pardoes will walk to the left and the drawbridge will open. You can walk in as quickly as you like without fearing a game softlock / crash.

Inside, click on Pardoes and grab the matches to light the candle. Then click on the grass near Pardoes' feet. Pardoes will start walking on one of the two paths that are available to him. Ignore the path on the left and click on the stone tiles on the right. Follow the path until Pardoes is standing on the last tile BUT NOT on the archway tile. You can only succesfully reach the archway tile without falling if you click there when the ghost holding the red gem is fully in the archway. Otherwise, you will fall and the game resets completely.

Once successfully done, the victory theme will play and a few seconds later the gem will show up. Grab the gem, and exit the area by going through the archway.