To enter values in the cells, you can just click and type in a natural way. A few special keyboard commands will help, though:
- “#” – toggles filled/unfilled squares;
- <Enter> allows you to type longer strings, which is useful for Kakuro split squares, which are entered like “5\7″, and KenKen constraints like “+5″, “/3″, “*15″ etc.
- Shift-Arrow creates a thick bar on the appropriate border.
- Space bar (and mouse click) change the orientation of the arrow which controls whether
the cursor advances to the across or down.
- Delete erases the contents of a cell
Thanks to http://www.sachsentext.de/en/ for some of the samples. Also see solutions to the variety Kakuro concocted for the MIT Mystery Hunt 2009