Kakuro++ Cross Sums by Chaviro Software FREE

 Kakuro++ Cross Sums comes from Chaviro Software.  I've been a fan of Kakuro since 1989 when it was called Cross Sums.

This particular game has 1430 levels in 11 categories of difficulty.

It's free and there are no ads.
https://itunes.apple.com/us/app/kakuro-cross-sums/id1445001139?mt=8