If you cant afford $0.5 minimum bet, you can find the challenge with lower minimum bet.
As far as I can see, there are 2 challenges with minimum bet $0.2 and many with $0.4 but it does not matter how lower the minimum bet, it may cost you a lot of money to hunt the specified multiplier for the challenge.
If you are familiar with slots, it is better to have challenge with higher min bet but with lower multiplier to chase.
For example, I'll prefer to chase 1000x with $0.5 than to chase 3000x with $0.2 but of course the specified game is also important thing to consider.

if you are a blackjack enjoyer, rainbet got you as they have released blackjack as their latest house game.
i played a few hands in the demo mode, and i have to say, the game is smooth.

they are also giving away random tips on twitter if you share your blackjack wins: https://x.com/rainbetcom/status/1885443903655923725

(don't bother trying the promo code, it's already gone)

The promo code you shared expired in less than 24 hours although it was available for 2000 users. That’s very impressive! I'll definitely keep an eye on their social media profiles from now on.

Wanted Dead or a Wild is a high volatility game. So, you shouldn’t expect wins too frequently but when you win, the payout is likely going to be huge.

I am not yet tried that slot game but you give me some ideas

Maybe I will try to play that slot game and see if I can hit big multiplier so I can give that to @Hhampuz to participate the contest

Ah, Wanted Dead or a Wild is the difficult slot game. I don't get a nice result playing on that slot game. But yes, that makes curious to keep trying playing on that slot.

@jayce and @xGennady have really enjoyed these rainbet contests 
Once again the emerged winners of the Rainbet Multiplier Contest Number 3 with some excellent high multipliers! looking forward to the next challenge.

Claimed 

Keep trying each week, you will eventually hit a high multiplier.

A little bit suggestion for you if you want to hunt high multiplier; try to play high-extreme volatility slots but with good RTP.
I havent checked all the available providers at rainbet, but if there is available then you can play games by Hacksaw and Push Gaming.
These 2 providers let you bet as low as $0.1 per spins (not all games) but most games allow you to bet $0.1 and I think it is better choice than you play Pragmatic Play if the main purpose is to chase high multiplier.
Avoid Play n Go, although it is good providers with good RTP but it is rarely give high multiplier, it gives multiplier like 200-300x easier than Pragmatic but it is harder to give multiplier than 500x.
Of course LUCK will always be the one and only factor, because without luck, no matter which game you play = no high multiplier.

hunting a high multiplier is a dangerous game to play. from my experience, i always hit one when i least expect it and never when i NEED IT.

everyone hates on pragmatic, but they are actually good for hunting BIG multipliers. the bad thing about them is that you need a juicy balance to stomach all the dead spins before you actually hit something.
but i agree, hacksaw (push gaming is not available on rainbet) will be the smarter choice with $0.1 spins, as you will be able to do 2x the amount of spins compared to pragmatic.

Rainbet have Hacksaw so maybe I will try it later especially when the new multiplier contest start

I hope this time I can get better multiplier but it seems beat @jayce and @xGennady is very difficult hahahah

I am having difficult to win nice multiplier in Pragmatic Play so I skip on that slot provider this time. So you give a good idea for me to start another provider. Thank you for the suggestion

But I will not trying hard to chase the big multiplier since I know that will not easy. So I just play like usual and let the result come to me. Who knows I can hit the big multiplier like them

Yeah you said it with right. I just participate in the contest and I know that will difficult and dangerous to chase the big multiplier. But I can afford to use some money to do that although I don't have a big chance to win big. We never know when we can hit big multiplier so we can only just try with limitation.

15.000X? Only those who have a big luck that can hit the big multiplier. Maybe we will wins someday but we don't have to chase the win.

Many slot games that we can try but we still be careful because slot game can tempt us to keep gambling. You need to use limitation playing slot game because you never know when the temptation become big.