Does the end game difficulty be the equalivant of expert but it HAS to be 8 buttons? I like rhythm games but there hasn't been one that's not miku since guitar hero III for me.
Hopefully the music isn't too anime for me. I tried OSU once but I needed a special keyboard to press multiple buttons at once and everything was super anime and 8 buttons only.
Every game mode (4, 5, 6 and 8 button) has 3 different difficulties, so you get hard songs for every mode. And the game is hard enough that even lower key counts still give enough of a challenge.
Personally, I wouldn't even consider the modes with more keys to necessarily be harder. 5 key songs for example often have tricky patterns that require you to figure out with which hand to press the middle button, which tlis something you never have to worry about in other modes. Even 4 key songs in general feel like they require faster button presses than 6 key, so even 4 key isn't necessarily easier than 6 or 8.
As far as the music is concerned, there's a lot of variety in the genres. There quite a bit of kpop (if that counts as anime), but also plenty of techno and the like.
If you're also looking for PC alternatives, Lunatic Rave (8 key) and Stepmania (4 key) are fairly popular and free. Osu is mostly 4 and
6 edit: 7 key honestly, and does have some non anime songs, although you will need to look for them.
