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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
     
 
30
 
11
  
 
6
 
13
    
 
 
12
4
14
12
14
 
15
  
40
 
 
12
23
 
9
6
4
10
 
8
 
 
19
20
 
 
 
16
10
16
7
10
3
 
13
6
5
15
20
 
11
 
 
6
  
8
 
 
14
10
17
 
8
5
 
11
4
7
15
 
36
 
   
11
 
12
 
    
00:00
You are playing 9x11 intermediate puzzle 5276

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