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.

	16	31	19			10	15	22
10				19	24 21
44									20
	15 11					12
8			15 24			14	16 8
11				20 34
27					10			8
		16			9	8 34			9
	17	30 12					11
9			18				3 29
11			25 10
	11			7	14			33	19
	11	4 29			28 26
34						9 11
10			12	4			11 15
17				28 13					14
	38
	7					24

Free online kakuro puzzles