The phrase "a series of tricky" is correct and usable in written English.
It can be used when referring to multiple challenging or difficult items, situations, or tasks that are related in some way.
Example: "The exam consisted of a series of tricky questions that tested our critical thinking skills."
Alternatives: "a set of challenging" or "a collection of difficult".
His eye troubles forced him to submit to a series of tricky and painful operations.
Whichever choice it makes, the Fed faces a series of tricky trade-offs.
Having warmed up their audience, Pedisich and Vernacchio issued a series of tricky relationship conundrums written on index cards.
People all over the country have discovered the joy of working together to face down a series of tricky puzzles.
Although a pilot had been paid to guide them, he didn't turn up, and Ike undertook a series of tricky manoeuvres to get the ship into open waters.
Advance Wars puts you in command of soldiers, tanks, battleships and other dangerous things and asks you to win a series of tricky battles.
WITH the urgency of a football coach scrawling plays on a blackboard, Mark Zannoni pins a diagram of subway tracks to his bulletin board, draws vigorous arrows and loops, and describes a series of tricky-sounding maneuvers.
Now the companies have decided to research whether it is worth trying to tap into a series of geologically tricky fields that hold another four billion barrels, or about half of Clair's oil, and create another production center, Mr. Garlick says.
Some people have him frozen in Lucite as the skinny, sneering, knock-kneed rocker with the Buddy Holly glasses and the New Wave suits who, in punk's wake, in the late seventies, unleashed a series of furious, lyrically tricky but not uncatchy albums and singles that still pop up on classic-rock radio or transgenerational playlists.
This book's series of tricky inversions culminates stunningly in a physical switcheroo that links Reacher and Plato, who have far more in common than either would care to admit.
A series of Euro-posters (some about tricky subjects like energy, others about more banal things such as product packaging) have popped up here and there.
