Osu standard : [ and ] Catch the Beat : Dash = space / left and right arrow keys Osu! Mania : 4k = E,R,I, and O ( all other keys 5k and up are default ) Taiko : Q,W,[, and ] or Q,S,', and ]
I used Z+X when I first started osu!, then when those keys got a bit worn out I switched over to C+V. Last week I started using Z+X again for some reason.