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.

		15	19		13	23		15	4
	13			12 16			10 23
	41 12
14					10 10
11			10	13 17				27	11
	9	24 13				11
17					5	13 24
17			6	7 20			12
		26 19					13 11
	18 30				10 15
11			24					15	8
13			11 24			13	9 8
18					21 17
15				23 20				23	10
		19				4	3 8
	9	12 5			20 14
36
3			9			6

Free online kakuro puzzles