For health as a gameplay mechanic, see: Health
For regulations surrounding HP drain rate, see: Ranking criteria
HP drain rate (HP) is a beatmap difficulty setting that controls how much health is passively lost to health drain. It also affects how heavily a player is penalised for missing notes and how much health is gained back by accurately hitting hit objects.
HP ranges from 0 to 10, where 10 is the most punishing and 0 is the most lenient.
There are four mods that alter the HP drain rate when activated: