What is the name of this Japanese resource?

Hello, I’m not sure if this is the place to ask this question so if anyone can guide me to the right place just in case, that’d be greatly appreciated. Otherwise…

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I have been learning Japanese for about 7 years now.

There was this website that I used to use back then that I adored. I would like to find it again but don’t remember the name of it at all. I’ve tried googling for a long time based on what I know about it but found nothing.

So my question to you is would you happen to know about this website? Has it been taken down?

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The website is used for learning Japanese, but also tracking what you’ve learnt.

You could see all Kanji in whatever filter you want, JLPT or by grade. You can learn it right there and it’ll add it to learnt Kanji.

There is a section for grammar as well with the same gimmick.

There are also Japanese word games on it that you can play with other people (I really had a lot of fun with this.)

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Just to mention, this is not necessarily a beginner-friendly Japanese learning site, but I loved it a lot because it really helped me. I don’t ever remember it being a mobile application, only web application.

Would anyone have any ideas as to what this resource’s name is? Or any idea what might have happened to it?