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Hi @vanj,
If there are too many players join in the contest, the winning rate will get below 5%, that would be bad for all of you. If there are plenty slots available, most players will wait for the end half of the day then place their numbers in the last minutes which will give them more chance to win then those who come early. I believe that the contest gets more competitive with that limitation. I know some players who have been using 2-3 accounts per contest, that is not fair for others with only 1 account. If there are more request from others, I will increase the limit to 40 slots soon with higher value upvotes.

ohhh ok. it's just the time difference that I can't get in. GMT+8 here :(

There are 6-7 contests per day, you still have a chance!
good luck!