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by suddensleep 2634 days ago
If I've researched this correctly, I believe that "Nikoli puzzles" are not a formal class of puzzles; rather the terms refers specifically to the publisher of these puzzles [1]. KenKen, on the other hand, was invented and trademarked separately by Tetsuya Miyamoto [2].

That being said, KenKen does seem to fall into a similar class of constraint-based, language-agnostic games.

[1] https://en.wikipedia.org/wiki/Nikoli_(publisher) [2] https://en.wikipedia.org/wiki/KenKen