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.

			16	14			13	39
		12 34				11 7
	11 8				7 14				34
3			33 7
32						15 16
	9 20			17			10
17			29	9 22			6 35
15					18	18
34						9 16
		34 43						29	20
	9 15			28
13				5	12 29
12			6				9 5
14			11 15			10 27			11
19				25 10
23							17 8
	12				20
	9				8

Free online kakuro puzzles