"challenging puzzle" is a correct and commonly used phrase in written English.
It refers to a difficult or complex task or problem that requires critical thinking and problem-solving skills to solve. Example: "The math problem on the exam was a challenging puzzle for the students, as it involved multiple steps and required them to use various formulas."
This does not bother me; it almost seems like value added to an already challenging puzzle.
(Nothing chilled the cold fires of my childhood mind like the gorgeous, sinisterly engrossing adult sibling of the Adventure books, "Maze: Solve the World's Most Challenging Puzzle" by Christopher Manson.
And what a challenging puzzle he hath wrought.
I didn't do very well on this challenging puzzle, but hopefully the practice will only serve to ENSTEEL me.
His intricately constructed plots are studded with challenging puzzle components like coded messages and locked-room crime scenes.
It's a fun and occasionally challenging puzzle, but, if surgery or Lemmings don't interest you, then you'll probably want to give it a miss.
Horn's simple finger-swipe combat, a necessary concession for a gaming platform without proper buttons, is offset by challenging puzzles and dynamic, open-world exploration.
As a game, it is simply a collection of clever, challenging puzzles interspersed with mild action, equal parts Tomb Raider and Myst.
iPhone / iPad Out in time for Christmas, Republique justified its pre-launch hype: a stealth-action adventure with startling graphics, properly challenging puzzles, and a storyline that draws you in.
Well, let's get something straight: what makes a great game are top-class graphics with an interactive world you can blow up, challenging puzzles and things to kill.
Geoff Thew of Hardcore Gamer wrote that Broken Sword was known for "intricate, challenging puzzles (some infamously so)." The puzzle appeared on Computer and Video Games 2011 feature, "Gaming's hardest puzzles".
