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: Not sure what a number is yet? Fill in its remaining possible values -- the cell will automatically resize to accommodate.

		24	44	16		22	20
	21 17				10 15
40								12	18
19				33 14
		8 41			6	13 33
	33 12						17 17
31								31
23					19 13				17
	17 16			12 19			11
17			7				13 42
12			13 9			6			13
	22				9	8 11
	8	31 18
11			33 25
12				19	5 13			9	12
35						7 4
		32
		16			12

Free online kakuro puzzles