Li Shenron
Legend
I feel good roleplayers should easily be capable of playing dumber than they, the players, are. Constantly shooting out solutions to puzzles and well-crafted tactical plans when you're playing an Int 6 Half-Orc Barbarian smacks of "I need good Str, Dex, and Con! I have to dump some attribute! But I still should be rewarded for being smart as a player, even if I choose not to roleplay!" to me.
No, because puzzles, plot solution, and overall strategy are not resolved by the PC, they are inevitably resolved by the players. Call them "metachallenges" if you want.
If you want a puzzle to be solved by the PC alone, probably you could just tell the group "here there's a puzzle, everybody makes an Int check" and no need to even describe the puzzle. Which obviously is not a suggestion...