Follow the instructions below to get all of the stud multiplier Red Bricks. Their effects stack, so when all of the stud multipliers are active at once, every single stud will be worth 3840 studs.
Studs Score Multiplier x2 – First, you must begin the “Over Hill and Under Hill” level. Play as an elf, and use your bow and arrows to shoot the yellow slots on the cliff. This will allow you to swing from arrow to arrow over to the schematic for the Mithril Flail.
Go to Bree and forge the Mithril Flail at the blacksmith’s shop.
Go to Hobbiton during the day. At the north of the map, you’ll find a character who wants the Mithril Flail. Give it to them to make the Red Brick available. It costs 500,000 studs.
Studs Score Multiplier x4 – Find the yellow and purple sign to the southeast of Bree. Go in the direction of the yellow arrows. If you reach a point where you only see purple arrows, go the other way to reach a yellow arrow instead. At the end, two yellow arrows should point to a section of dirt you can dig up. A key is buried there.
Use the key at the nearby altar and present crafting items. If you don’t have the items, go to Erebor to buy them. Once you put the crafting items on the altar, you’ll receive the schematic for the Mithril Shadow Blade.
Go to Bree and forge the Mithril Shadow Blade at the blacksmith’s shop.
Next, go to the High Pass, which is to the east of Rivendell. When you reach the brick cliff, climb down it, cross the gap, and climb up to reach a character who wants the Mithril Shadow Blade. Give it to them to make the Red Brick available. It costs 1,500,000 studs.
Studs Score Multiplier x6 – There is a wall you can only climb as a goblin between Dol Guldur and Rhovanion. Do so, make your way from platform to platform, and then use a flower to get to the jump pads. This will take you to a mountain road. Go to the nearby cave and get the block to the edge. Light a fire and destroy the chest. This will give you the schematic for the Mithril Construction Hat.
Go to Bree and forge the Mithril Construction Hat at the blacksmith’s shop.
Go to Moria and head south, toward the water. A character near a tent wants the Mithril Construction Hat. Give it to them to make the Red Brick Available. It costs 4,500,000 studs.
Studs Score Multiplier x8 – Go to the Pass of Caradhras, which is south of Rivendell. Find the cave with the mithril rocks, and destroy them. Inside the cave, the schematic for the Mithril Beanstalk is by a snowman.
Go to Bree and forge the Mithril Beanstalk at the blacksmith’s shop.
Leave Bree from the entrance that leads toward Hobbiton. Head down the southern path until you reach a character at the edge of a cliff who wants the Mithril Beanstalk. Give it to them to make the Red Brick Available. It costs 10,000,000 studs.
Studs Score Multiplier x10 – Go to Dol Guldur and enter the forest to the south. When you find wooden bricks that sparkle, destroy them with Bilbo and the ring to reveal the entrance to a cave. Inside is an altar. To the right, you can dig in loose dirt to find a key. To the left, you can shoot a target beneath an owl to get another key. In front and to the left, you can break some bricks to find the third key. Use the keys at the altar to get the schematic for the Mithril Candle Staff.
Go to Bree and forge the Mithril Candle Staff at the blacksmith’s shop.
Return to Dol Guldur and enter the forest to the west. If you have completed all the other optional quests, you should encounter a character who wants the Mithril Candle Staff. Give it to them to make the Red Brick Available. It costs 20,000,000 studs.
[more cheats for LEGO: The Hobbit here]