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.

	10	16	18			6	4
20					3 3			11
10				10 16					16
		18					9 19
	13	11 7				20 7
6					11 18			24
13				29 8					15
3			12 11				16
		13 25				6	14 10
	11 17				13 6
9				6				20	10
16			19	3 12			4
	15						10 15
	16	17 16				21 12
24					13 8
15			10	11 14				13	6
	11					7
		16				17

Free online kakuro puzzles