Popular Playthings Utopia Brainteaser Puzzle Grab your hard hat and start building Utopia, the futuristic cityscape brainteaser from Popular Playthings Challenges increase in difficulty: Phase 1 rules are similar to Sudoku and Phase 2 requires all your logic and reasoning skills Includes Utopia Base, 16 skyscrapers, 50 challenge cards with solutions, and instruction booklet For ages 8 and up Popular Playthings provides award-winning toys that encourage learning, creativity, social interaction, and good old basic fun