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.

			13	15		11	13
		17 37			16 17			11	27
	36 5
5			4	12 7			9 25
20						11 4
	9 6				25 6
4				12 17				18
14			12 13			8			6
	16	17 8				21	9 14
17					29 17
10			13	22				39	10
	3			11 5			7
	26	10 14				13	17 10
16					22				17
20				24	18 8
12			8 7			5	16 6
41
		10			3

Free online kakuro puzzles