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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.

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Kakuro Hint: Not sure what a number is yet? Fill in its remaining possible values -- the cell will automatically resize to accommodate.

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Also try sudoku and hitori
     
 
6
 
4
 
12
    
 
7
 
11
   
8
12
  
15
13
 
13
17
7
10
12
 
  
12
10
 
31
 
10
12
 
 
11
6
20
9
4
 
38
 
 
 
13
5
4
14
25
16
 
  
7
17
8
 
8
17
9
16
  
   
35
16
 
13
 
8
 
15
26
12
 
6
15
9
 
 
4
26
25
14
 
13
11
 
29
  
37
 
 
9
3
 
17
13
  
8
18
 
 
11
16
10
 
11
15
14
10
 
27
 
  
17
 
  
24
 
    
00:00
You are playing 9x17 hard puzzle 27860

Start over, and play another kakuro of this size and difficulty.


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