Head-To-Head V2，but it's FNF(MIX Track update)

This update has added new mix tracks, which were changed to normal Hard difficulty in the previous version. Mix tracks have two difficulty levels, one without a special button and the other with a special button

My Bilibili homepage:https://space.bilibili.com/517184553

Voice production of songs:https://space.bilibili.com/3494379027171367?spm_id_from=333.999.0.0

#fnf