Can you crack the case?

All the slots of Gaminator have come to the courtroom to claim that they’re the best slot in history! Prove which one is telling the truth. Here’s how:

Stake as much as you can between 25.05 and 26.05. Your detective work will be rewarded with a bonus on 27.05*!

Here are the Challenge goals:
S = Stake at least 500,000 Credits
M = Stake at least 7,000,000 Credits
L = Stake at least 140,000,000 Credits
XL = Stake at least 400,000,000 Credits