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.

		37	10		8	17		35	26
	4 14			9			15 15
6				30 13
25					33	22 14
8			18				17 19
5			18 17
	13 10			20				13	9
12				17 9
16			9 25			22 11
	16	6 3			14 33			37	7
19				8 12			4 15
29						12
		9 35				14 12			26
	26 18						15
6			22 10				12 21
10				12	10 3
26						24
16			11			16

Free online kakuro puzzles