Kakuro -
I solved the table and it all worked but as it did not match theirs it would not complete. They obviously do not test to see if other solutions will work
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Kakuro Cross Sums Puzzles appears to be a legitimate app. AppsHunter Legitimacy Score for Kakuro Cross Sums Puzzles is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.