Well, that's an unusually neat Kakuro solution:
Presumably the other puzzle is something that involves
creating a sort of "snake" of numbers in boxes going all over the board, forming a loop that starts from 1 and goes up to 26.
Hmm ...Yep, apparently it's called
26, something to do with letters insteadHidato (and I've actually solved both the puzzles in my intuitive understanding of what must be going on with the sequence of numbers? here).