Hey there!

For such challenges as this one, there is no limit on how many users can participate and win. You will be able to see that as well if you open the spoiler in the opening post of the challenge:

"All players who complete the challenge in the next 7 days, will get a share in the prize pool! There is no limit to the number of winners, and the more people who get involved, the higher the prize pool! So if you get more people involved, then you win more!"

If you still have some questions, feel free to contact us on Live Support chat at any time since we are available 24/7.

Have a lovely day!