They're two different things now
Lybydose wrote:ok now post here https://osu.ppy.sh/forum/t/104808/start=15
Also newer pop'n games use a rainbow "COOL!" instead of "FEVER!"
"Cool" is part of the scoring system (Cool->Great->Good->Bad)
"Fever" is activated at certain points,when the player successfully hits the notes in those points.
Works like kiai mode in osu! I think