Kakuro

Once again, your brain is put to the test. Can it meet the challenge?

Hot on the heels of Sudoku, comes Kakuro, the crossword puzzle with numbers. It's not just about logic anymore, now you also have to know how to add. Instead of sentence clues, you're presented with number clues. You have to enter digits into each column and row so that their numbers add up to the sum presented by the corresponding number clues. You can only use digits from 1 to 9 and you can't use the same digit twice in the same column or row.

As usual, Dr. Tetsuo is available to help you along the way. He's made some helpful options available to all those willing to take his Kakuro challenge. In addition to things like pencil marks and row/column highlights, you can be informed whenever the digits you've entered do not add up to a number clue, or whenever you duplicated a digit in a row or column. You can also choose to view all the possible combinations of digits for the highlighted number clues.

Dr. Tetsuo's Kakuro also comes equipped with its own solver, as well as the option to make your own kakuro boards. Dr. Tetsuo's boards come in three difficulty levels, and the best solving time for each difficulty is saved. So help Dr. Tetsuo continue his research and put your brain to the test.