Kakuro

Language:

4x4: easy intermediate hard challenging expert
6x6: easy intermediate hard challenging expert
8x8: easy intermediate hard challenging expert
9x11: easy intermediate hard challenging expert
9x17: easy intermediate hard challenging expert

Kakuro is like a crossword puzzle with numbers. Each "word" must add up to the number provided in the clue above it or to the left. Words can only use the numbers 1 through 9, and a given number can only be used once in a word. Every kakuro puzzle has one and only solution, and can be solved through logic alone.

Kakuro Blog
Kakuro Rules
Kakuro Tutorials: Basic Challenging

Kakuro Hint: Start with clues that only have one valid combination. For example, 3 in 2 must be 1 and 2, and 23 in 3 must be 6, 8, and 9.

		15	29		16	37		24	11
	8			13 15			16 26
	43 17
29					27
11					10 16
13			9	10 19				39	32
		25 36					16 15
	17 17				21 14
16			6			20 18
10			19 16				17
17				6 39			13 16
22					20 10
12			24 15					17	18
		18 29					15 28
	19 20					11 14
22					29 9
36
16			3			6

Free online kakuro puzzles