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.

	8	10		42	7		17	40	11
7			7			22 11
4			31 29
	30						3 6
	28	10 18			6 24
38									4
20							12
12			16			16	9 11
11			15	11 9				33	20
23					25 15
	12	18 39				42	10
10				6			4 16
6			10	31 11
	36
	20 24				8 7			10
12			26 16						12
39							4
23				11			12

Free online kakuro puzzles