North American Birds 'Scramble Squares' by b. dazzle inc. Easy to Play but Hard to Solve Perhaps the world's most challenging puzzle. FInished puzzle 12' X 12'. For ages 4-104. Unscramble the nine square pieces by perfectly matching the pictures on the squares' edges forming a large square. Can you unscramble the squares without scrambling your brain? Designed in the USA and printed in Canada.