3.
Roobet Crash Multiplier ChallengeMinimum of $1 wager , try to chase and win those high multiplier and post on the thread Thats it. If you are top 2 or top 3, you are going to get double of what you won. Triple winning amount if you are the top 1 multiplier
This one ended but might come back in the future, stay tuned

Only one participant in this promo unfortunately, probably the minimum bet is the one that makes it get less interest.
Frankly speaking, hunting high multiplier in order to win the competition is very challenging but for me $1 min bet is too big (perhaps for some other people too)
Probably reducing the minimum bet will be better and may get more participants.