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
 
32
 
 
18
 
12
 
4
   
 
3
 
13
11
 
5
 
14
 
41
7
24
 
13
8
9
 
 
11
8
18
 
30
 
9
 
13
6
12
10
12
 
24
7
16
32
10
 
15
17
 
10
 
 
3
11
9
 
18
11
11
7
 
28
5
44
 
 
   
13
 
8
 
 
00:00
You are playing 9x11 hard puzzle 3548

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