Shoot the tree on the far left. Three pieces of bark will fall off, revealing a treasure map. The three symbols show the location of hidden caves. The "X" marks the cave that contains hidden Moorhuhn gold. To enter these caves, use the green 1A ammunition to shoot the rocks in a specific pattern. When the gold is revealed, shoot it and a "Treasure Bonuses" message will appear. You will also get a 200 point bonus.