Like Portal, World of Goo, Talos Principle? Or are those too RPG/adventurey?
Seems most people want puzzles in a context, rather than just raw?
If I go to search and put "puzzle" I get pages of puzzles and can choose a tighter genre to narrow it down. If I go to Portal 2, say, I get "more like this" (Qube looks interesting).
What's your best puzzle game?