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.

	9	12		13	20	13	11
3			11 34
34								29	11
	8			12 10			3
	3	18 35				3	13 20
41									4
19					14
	21 5				22	10 16
6				24 12				15	8
10			21 28				4
	14	21 26				28	12 28
10				7	13				4
20					12 15
	42 10
13				11 17				24
12			4 3			17 10			10
		41
		14					15

Free online kakuro puzzles