In total there are 11 locations in The Lego Movie 2 where you can find Master Piece bricks. These are found in Apocalypseburg, Asteroid Field, Systarian Jungle, Harmony City, Old West, Sorting Area, Classic Bricksburg, Middle Zealand, Planet Unikitty, Planet Sparkles and The Ceremony. Check out the videos below to see the exact spot each is hidden.
Master Piece Bricks In Apocalypseburg:Master Pieces Bricks In Asteroid Field:Master Piece Bricks In Systarian Jungle:Master Pieces Bricks In Harmony CityMaster Pieces Bricks In Old WestMaster Pieces Bricks In The Cermony