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.

		38	16			14	12	21	19
	14 12				29 8
11				15 25
12			15 8				15 10
	10 12					16 35
28					10 28			21	11
28							16 18
6				34
3			21	13 27
		24 17						38	23
	14 4						15
31						28	12 17
12			39 5
		9 13			20
	9 24				9 8				8
13			13	11 9			6 8
17						21
26						8

Free online kakuro puzzles