That's right, I hit the desired number with 24th bet once, and the win chance was 0.01%. Today I tried my luck in PD Olympics: Fencing but failed to roll what needed to be rolled for qualifying within 300+ rolls. And the win chance was 0.03% this time, 3 times more likely to hit what I need. Eventually I stopped with this as the closest one:
No win this time, but it was a fun ride.
May be you could get the required 3300x payout soon. As you said, you had 3 close hits then, i guess 3300x is not far. This happened to me too. I stopped playing when i experienced lot of loss while trying to complete a challenge. Sadly, i got the required roll within few bets after the challenge period. Anyway good to see some pretty big winnings on the pd forum. Majority of the players won more than what they can get from this challenge.