Address:Unit 302, Tower B, Cambridge Plaza,188 San Wan Road, Sheung Shui, Hong Kong Zip:-
Specifications: More advance than sudoku. It combines the mathematic and logic together. A good item to train the human brain. With various size of grids, from 3x3,3x4,4x4,4x5,5x5,5x6,6x6 and 6x8. You can try various difficulty.