The phrase "a straightforward challenge" is correct and usable in written English.
It can be used to describe a task or problem that is clear and uncomplicated.
Example: "The project presented a straightforward challenge that the team was eager to tackle."
Alternatives: "a simple challenge" or "an easy challenge".
As in every one of the tales told here, a straightforward challenge or mission artfully escalates into something more complex.
On the surface, the court was considering a straightforward challenge to the admissions policy of a Jewish high school in London.
Bobby Madden somehow decreed that a straightforward challenge by Adam Matthews on Mackay-Steven was worthy of a penalty, despite neither the winger nor any of his United team-mates claiming for one.
The lawsuit, a straightforward challenge to the N.C.A.A.'s authority, asks a federal court to throw out all of the penalties against Penn State's football program, including a $60 million fine, the vacating of a decade's worth of victories, and a four-year ban on postseason play.
Rift Portals, too, seems like a straightforward challenge: Epic has often integrated items like that into the challenges a few weeks after their initial release.
Davis presents a mostly straightforward challenge because he and receiver Michael Crabtree are the 49ers' most potent threats.
It's a pretty straightforward challenge, and one can't help but imagine Epic put it in there because it's tried and true, with no tricky implementation problems that could interfere with a much-deserved vacation.
Making smarter weapons has been a much more straightforward challenge than developing the communications networks and management systems needed to use them effectively as battles unfold, especially against mobile targets.
The music could be called intermediate-level in that each piece presents a straightforward musical challenge.
"Eliminate Opponents" sounds like a placeholder to me: we do see that straightforward challenge pop up in Week 10 sometimes, but it usually requires 10 eliminations.
The most straightforward challenge emphasizes that decision-making inherently involves a present- and future-oriented perspective: the surrogate must make the best decision for the patient in front of him about how to manage this patient's life from now on.
