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 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
   
 
28
 
8
   
 
4
 
26
 
26
 
17
 
10
23
 
13
27
 
30
 
20
19
10
 
16
 
10
16
15
 
 
11
15
27
 
9
 
 
3
13
24
10
10
22
 
29
18
11
 
21
26
 
15
 
10
 
14
6
 
11
4
 
10
 
4
8
16
12
24
 
15
 
14
 
 
10
 
 
00:00
You are playing 9x11 hard puzzle 5513

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