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
   
 
10
 
7
   
 
17
 
4
 
31
 
 
10
19
 
11
15
 
8
13
 
21
20
10
 
12
10
 
13
10
13
 
 
19
15
31
 
8
 
 
9
28
31
16
 
6
13
16
14
38
 
 
29
 
9
 
17
4
 
30
13
7
 
 
12
16
14
9
10
18
 
18
 
 
22
 
 
8
 
 
00:00
You are playing 9x11 challenging puzzle 5021

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