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.

			8	31			19	17	8
		8 30			10	23 15
	44 4
10			18 27
15					11 29			17	19
	14 17					8 10
39							10
11				7 9			16 4
14			9 12			7 7
		15 17			7 29			32	7
	10 23			10 9			9 27
16			16			10 28
7			34 31
12				12 6					17
		7 10			29 7
	18 4						10 9
39
10					14

Free online kakuro puzzles