no damage run

https://alpha-wiki.win/index.php/How_a_Survival_Horror_Walkthrough_Saves_You_Time_and_Sanity

A no damage run is a self-imposed challenge where you try to complete a game without taking any hits, staying at full health the entire time. It's a test of perfect play that demands deep knowledge of enemy patterns and tight execution. Seeing someone pull it off, especially on a tough boss, is incredibly satisfying and tense to watch.