After you get there, explore the area on the left and smash the small fence.
you’re able to now switch to Bilbo and walk through the passage here.
The passage will take you to the upper balcony.
you’re free to now return to the lower level and pick up the skull.
You now need to go right, enter the aiming mode and throw the skull at the barricade above.
Wait for the barricade to fall apart and approach the elements scattered around the place.
Hold down the building key/button.
Switch to the confused goblin and use the fact that goblins can climb over the select walls.
In this particular case, you oughta climb the wall shown in the above screenshot.
Go a bit ahead, jump down and stop.
Smash the barricade right next to the chasm and start building again.
The purpose of this action is to build a bridge for Bilbo to walk over .
you’re free to now go ahead.
Stop after you reach another big cave and start smashing the objects located on the right.
One of them is a skeleton, thanks to which you will obtain another skull.
After the crate falls to the ground and falls apart, start building again.
You will build a Craft Plate.
Interact with the plate and spend some of the supplies.
What is required is 10 Rope, 15 Wood and 10 Iron.
Wait for the minigame to start and have a go at handle it as well as possible.
Approach the catapult and jump into it, as one of the characters.
you’re able to now enter the newly-unlocked cave, where you will meet the Gollum.
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