This MasterPieces Tetris 6" x 6" 77pc Tetris Layered Brainteaser features three different layers of tetrimino pieces, ready to be layered, turned, flipped, and fit together! Play with the time-honored Tetris gamepieces, and let them test your brain's limits. These Tetris Brainteasers are fun for every generation. To reduce their impact on our environment, the chipboard used in these puzzles is made of recycled material.