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 Hint: Not sure what all of the valid combinations are for a number? Click on the number clue, and a tooltip will show you the possibilities.

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Also try sudoku and hitori
 
 
4
 
7
 
 
11
 
17
 
12
 
10
 
27
 
8
 
18
15
 
41
 
 
17
 
 
3
12
9
 
11
15
18
 
 
12
17
12
8
 
 
9
18
10
   
   
15
 
 
6
 
12
 
 
5
19
23
 
11
14
17
18
 
 
18
19
9
 
 
12
12
16
 
5
 
11
 
41
 
 
18
 
12
 
00:00
You are playing 9x11 expert puzzle 14650

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