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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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Also try sudoku and hitori
     
 
4
 
17
 
26
  
 
12
 
15
  
   
6
21
7
17
 
11
 
37
14
13
 
24
 
4
6
7
 
9
11
18
20
 
6
10
13
28
 
12
 
19
13
 
16
12
14
25
15
 
37
19
   
14
14
10
23
 
41
22
  
12
 
11
6
 
27
 
15
21
 
8
9
9
 
4
6
17
29
 
 
24
4
23
18
14
 
11
22
 
17
10
12
 
14
 
20
17
3
12
37
 
  
 
11
 
17
 
    
00:00
You are playing 9x17 intermediate puzzle 43749

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