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.

		19	6	13	12		15	42
	10 9					11 12
39									17
13			10	11 13			10 15
		6 31			21 11
	14 7					17
31						23	14 10
13					30 24
7			17	15 19				23
	37								17
	28	23 28				30	16 11
16					16 17
16			13	27
22				17 17
16					13 19			15	7
10			3 11			11	15 8
	43
	14			14

Free online kakuro puzzles