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I tried playing plinko on hard mode in hopes of getting 1000x. It turns out that getting a 1000x multiplier is very difficult, but several of my friends gotten it. I only got 26x multiplier, which is pretty good and I got a small win.
A 1000x multiplier is indeed very difficult to win:
SourceThis is not necessarily 100% true for BC.Game, as the probability depends heavily on how many lines there are in the Plinko game. But the graphic shows quite clearly how unlikely such a high win is.
However, a 26x is also not without and definitely a great result!