Welcome to kakuro, the addictive brain teaser! This Japanese puzzle
craze, sometimes called cross-sums or kakro, is sudoku's bigger (and
tougher) brother. As with all good puzzles, the rules are easy to learn
but the game is difficult to master. These 101 puzzles are specifically
designed to introduce novices to the game.
Like a crossword puzzle, the playing area consists of filled and empty
squares. Some of the black squares contain a diagonal slash from top
left to bottom right, with numbers in them--the clues. A number in the
top right corner relates to an across clue, and one in the bottom left
to a down clue. The object is to insert digits from 1 to 9 into the
white squares that add up to the associated clue; however, no digit can
be duplicated in an entry. For example, for a total of 6, you could have
1 and 5 or 2 and 4, but not 3 and 3. Easy, right? Beware! It gets more
complicated. In case you're stumped, solutions appear at the end.