The phrase "fun challenge" means an activity or task that brings enjoyment and excitement while also requiring thought, effort, and problem-solving skills to overcome. Full definition
These are completely separate to the standard bucket list and work more as just fun challenges for you to undertake. (xboxenthusiast.com)
But the other fun challenge of DE: HR was trying to kill as few people as possible. (gameological.com)
I am interested in applying my past experience engaging in new fun challenges with new technologies to build creative and automated solutions! (members.climber.com)