offers the reader a selection of grids with a unique solution. These grids are extremely easy at the beginning. Our aim is to help you get used to the principle of the game. The level of the grids gets harder and harder as you continue and the last ones can be pretty tricky. But in any case, the pleasure of using logic and solving the puzzle is total.

To help you, a central pull-out supplement in a thicker paper gives you the rules, a few hints and tips and most importantly a table of unique combinations which is indispensable at the beginning.