Daily Hadoku for 2017 Feb 23

Hadoku is like irregular Sudoku - with a Twist. A small change of the rules creates an all new game. Hadoku can be very easy or extremely challenging, even for small grids.

Here is an example:

Sample Hadoku puzzle

You can solve it directly in your browser. Or select from list of all daily puzzles.

If you are new to Hadoku you can find a detailed walk-through of a sample puzzle.

Hadoku has the same rules as Hakyuu (波及効果) also called Ripple Effect or Seismic or Répulsion. But Hadokus are more interesting: they are smaller and often much harder to solve.