the BIG puzzle books
Each title in this series is a 8.5″x11″ paperback with 500 puzzles of different grid sizes that progressively increase in difficulty.
the BIG puzzle book of Hashiwokakero (Bridges)
US, CA; UK, DE, FR, ES, IT, other 
the BIG puzzle book of Hiroimono (Goishi)
US, CA; UK, DE, FR, ES, IT, other
