"Better than X% of the game geyser type" is incorrect, as it assumes a linear distribution

ONI uses a weighted distribution that prefers to group values towards the middle, which means that the shown percentile is wrong as extreme values are very rare.

The following code from my own repo shows how to get the actual percentile:
https://github.com/Hexicube/Hexicube.github.io/blob/master/compute.js#L199-L210