"Clever puzzles" refers to challenging and skillfully designed brain teasers or games that require creative thinking and problem-solving abilities to solve. Full definition
These are without a doubt, the highlight of the game as they require you to carefully solve clever puzzles and unlock secrets buried deep within each level. (gearnuke.com)
I actually prefer detective / mystery games with clever puzzles over the basic object search, as long as they are clever and not too easy or way too difficult. (lovemyfire.com)
Broken Age really encourages exploration — and element forced on you to advance the story, which often involves the use of clever puzzles which have equally easy to understand and use controls. (playstationlifestyle.net)