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.

	13	23		6	9			40	13
4			3 15			17	8
22							3 7
17					20
	12			32	19 14
	27	36 14							7
12			8				11
16			16 19			32	5 14
41								25	19
16					11 26
	8	30 39
16				3			17
8			23	9 19			16 28
	38							25
	17 20					16			24
16					5	24 12
14			35
13				6			17

Free online kakuro puzzles