Let's see: The Round 1 is over because no new deposit was received for 12 hours. In Round 1 we managed to double some deposits as long as the game had enough funds after paying the fees (5% to the first user that deposited, 5% @steemdoubler fee - we are not doing this for FREE and 10% for The Round Jackpot).
80% from each deposit is used to double earlier deposits! When we have enough funds to double the next deposit (ordered from the first to the last received) we will transfer the STEEM! If we don't have enough STEEM to double the next deposit from the list we are waiting more deposits, take out the fees and then we try to double again the same deposit.
You can win only if enough people will deposit after you this is why if you enter early in one round It is more likely to double your STEEM. Nobody will want to enter late because they can lose all the STEEM if the round will stop with no furure ROI. Here comes The Round Jackpot!
The Round Jackpot is the incentive for the people to continue to deposit even late because if no other user will deposit in the next 12 hours you will not double your STEEM but you will collect all The Round Jackpot (10% of all the deposits in that round)
Yes, we have winners and losers too but smart players can extend the round with small 10 STEEM deposits and can promote the game until they have the desired ROI. New players is a must for the round to continue and that should not be a problem because STEEM has over 130K accounts! :)