My ideas are the following:
Make sports betting challenges: For example, the first person to make a successful combination (with a specific minimum bet) of more than 5,10,15, games will receive the prize.
Original stakes: The first person to get the highest multiplier will win the challenge, for example: the first person to get x1000 with a bet of 0.10 in Plinko will be the winner of the challenge.
Hacksaw challenge: the first person to get one of the rarest bonuses in hacksaw will win the prize, for example: get the 5 scatters in Le Bandit, or 5 scatters in Drop em, etc.
My user on Stake: Weberk