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.

		21	21	12	13	35		42	13
	26 11						10
21							8 15
14				25					12
22				12	23
		4 7			11 35
	11 14					10			8
8			14			13	10 6
12			15	31 17
	17	35 43						22	11
35						19	9
16			13	3			17 27
	8 7			25 16
20					16			24	23
14					24	9
	25 14					24 16
6			34
12			30

Free online kakuro puzzles