Kakuro - 9x11 challenging online kakuro logic puzzle

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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.

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Also try sudoku and hitori

	16	31	12		20	3		26	11
8				9			9 3
19				20 3
13			3 28			12
15						4	3 11
23				7 3
		8			8 16			33	18
	11	13 20				19 8
6			5	15
17				4 13			13 14
15						12
5			14			19