Daily Hakyuu for 2013 May 23
Hakyuu is like Sudoku - with a Twist. A small change of the rules creates an all new game. Hakyuu can be very easy or extremely challenging, even for small grids.
Here is an example:
You can solve it directly in your browser. Or try our applet (Java required). Or you can try an easier example (even easier). Or select from list of all daily puzzles. A free app with lots of additional puzzles is available for the iPhone and the iPad.
If you are new to Hakyuu you can find a detailed walk-through of a sample puzzle.
Hakyuu (波及効果) is also called Ripple Effect or Seismic or Répulsion.