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.

	19	36	11	24			13	11	7
27						11 33
13					11 10
14			20 20				11 23
	14 12			24				25
16				25	24				22
15					27 16
10			20				16 3
13			10 7			8 16
	11	9 27			3 8			44	16
20				4 37			8
4			16 10				10 11
26					17
	14				13	19
	24	19 18				17 22			22
15			17 16				8 8
25					28
20					17

Free online kakuro puzzles