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With many higher levels being consistently difficult, it is a curiosity how King can mark certain levels as "hard", "super hard" and "nightmarishly hard". As of now, here are the patterns I've saw:
I wonder how does King select certain levels as hard? Are they hand selected? Is it based on the success rate?
I would suggest the following
Here's my guess: it is based on the winrate of the level *and the winrate of normal levels*. The person who grades the difficulty might look at the last 10 normal levels and marks the next level hard *if the winrate significantly decreases*. It is not based on raw winrate alone, and a good example is level 10. It's easy based on raw winrate, but levels 1-9 are basically *very easy*, while level 10 is only *easy*. And so it is marked as hard.
But there are problems with the relative difficulty scheme, too. You can't compare the difficulty of different levels easily, and for most players, this is not what they want. People want raw difficulty and raw winrate. And that's exactly what the Fandom wiki has! So if you want more accurate difficulties, check out the wiki here:
King do not select the difficulty rating of any of the levels as this is completed by a script that runs in the background.
I imagine a lot of the issues that we see with unmarked levels being just as difficult as levels marked as Nightmarishly Hard and the distribution of the number of Hard levels is caused by the script being out of date.