Looking at the history, yes, it seems i updated a couple of languages, including Java, three months ago. I admit I can't remember what exactly I changed, but its very possible I hardened tests to bring all languages to the same difficulty level.

Done

I've try to do this kata in java but, it's keep getting over 16000ms, i'm stuck xD

I agree..

Yeah, this platform is fun for experienced programmers trying out new problems or crowdsourcing interesting challenges, but for learning and going through a curriculum that, say, prepares for coding interviews, I've been really impressed with codesignal.