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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
 
 
3
 
41
    
 
5
 
18
  
 
13
 
8
8
 
  
11
 
11
19
9
 
 
14
30
13
 
12
15
9
35
 
37
 
32
19
 
14
10
14
 
7
8
10
 
14
 
24
 
8
20
8
 
6
8
22
13
16
 
18
6
 
 
16
4
13
23
12
 
9
25
 
  
14
 
15
 
6
 
  
11
 
00:00
You are playing 9x11 challenging puzzle 45237

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