Kakuro
Tutorial -- Challenging
18 in 4 with an 8 must be 1, 2, 3, 4, and 8, so we fill in the possibilities.
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13
10
8
3
27
12
11
7
8
24
5
27
26
16
9
12
12
11
21
30
39
17
10
6
10
12
8
18
10
7
13
14