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.

			12	8	36		7	31	16
		14 15				16
	11 6					7 8
6				8			12
13				14 37			15 31
3			7 12			10
	13					7 29
	16	27 20						16	12
17			38 33
14					17 37
36							17 11
		19 27						15
	7 15			12					19
10				15 4			3 20
4			7			15
8			12 9			11 10
12				22
22				11

Free online kakuro puzzles