This is stake.com there are no wager requirements except bonus offers via email this means that all balances have been credited without any requirements
You don't need to worry about anything if you want to participate all purely because of luck, first your page number must be included in the list to be selected by admin then they will choose 1 of 25 participants in 1 page. I know some participants are trying to attract admin  attention by adding images/animation but doesn't guarantee anything, This Saturday I was lucky because my page number was included in the list 2 times this means 2 admins will select 2 winners among 25 participants.