Throughout Middle-earth there are 20 red bricks for you to find an unlock. The in-game map will show you how many red bricks can be found in each part of Middle-earth by hovering over the Map Stone in each location. Every red brick is unlocked by completing a fetch quest for a Mithril item. You cannot find these items, but must craft them at the Blacksmith in Bree. To do this you will first need to find the design itself, then you will need to gather Mithril bricks for the blacksmith to craft the item. The designs are found in the levels and throughout Middle-earth. If you need any help finding them, or need to know how to craft the items, check out our Blacksmith Design Guide. Mithril bricks are unlocked for achieving certain things within the game. You can get them for completing a level in story mode, achieving true adventurer on a level, completing a minikit, completing a fetch quest etc… When you have finished the fetch quest, the red brick will appear next to the person you helped. You must click on it and buy it using studs you have collected, for it to be available for you to use. You can then turn it on in the Extras menu, which you can find by pressing start at any time.