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	24		5	35
		12 31			6			13	11
	23 15				18 8
12			3			23 9
7			24 17
	15				12 13			17	10
	12 10			6 14			13 8
3			13			19 11
16			11 20
		16			5 24			37	17
	12	15 14					9
23				9 23			11 3
11			16 19			9
		11			3	7 26			5
	5	26 11					5
7				9 9			13 16
13					23
		12			10

Free online kakuro puzzles