Sometimes, author of this challenge doesn't know what to write at the description but he doesn't want to let it blank either.
So he writes something over here. :))
Good luck. This challenge never requires guessing. nc 188.8.131.52 54321 [Attachments]
Dear hackers, pwners, and web warriors,
Let's play badminton together for your health.
Before playing, you may want to check our courses to learn some basic skills firstly.
If you want a real match, please come here. We can have fun :p Courses