Solve the Unsolvable: This 639-piece lenticular 28"x19” puzzle features layers of Tetris tetrominos with color-shifting puzzle pieces that will keep you guessing all the way to the last piece 2-in-1 Puzzle: Want even more of a challenge? If you solve the impossible, add on the 56 bonus pieces for an extra 9.25”x 6.25” tetromino piece puzzle to add additional complexity Solve & Display: Once you’re done, display your puzzle with the included matching poster Family Game Night: Keep the fun going with more Spin Master Games to add to your family’s board game shelf: Hedbanz, Beat the Parents, Family Feud, Jumanji, Wicked: The Game, Mind the Gap & more Spin Master Games & Toys: Looking for kids games, yard games & card games for adults, kids or teens? Find family favorite puzzles & games for family game night, travel games, kids puzzles & more Includes: Lenticular Puzzle, Poster