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.

	12	38		16	17			11	20
8			11 28				10 10
19						21 12
	13			15
	15 10			18 17				23
25					28	8 8			26
9			14 8				17 12
21				19 8
	20	12 19				24 13
14			12 12				9 6
14				11 5				29	19
16						16 6
16			10 25				13 29
	7			4	14 25
	17	10 24				8
31						14 11			5
23				34
16				3			3

Free online kakuro puzzles