Skyscrapers [SKYS-1-006P]
Similar Puzzle Books
1000 Number Logic Puzzles
US, CA; UK, DE, FR, ES, IT, other 
Puzzles in this book: Straights (Str8ts), Nanro, Bricks, Number Ball, Suguru (Kemaru), Different Neighbors, Sukoro, Skyscrapers, Ripple Effect, and Neighboring Dominoes.
