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: Not sure what a number is yet? Fill in its remaining possible values -- the cell will automatically resize to accommodate.

	33	18		4	11	23	7
6			12 7
42								12	27
13				18
10			28	5 6			5 10
10					15
	30	6 12			14	19 13
14				17				28	10
19				9 17			7 15
30					11 11
12			3 17			13
	10	17 26				15 10
10				16	14			29	16
21					12 11
9			6 20				9 12
19						10 5
		38
		17					15

Free online kakuro puzzles