1. The Mission: You are a Non-specific Cytotoxic Cell (NCC). You must eliminate cellular threats before the virus spreads uncontrollably.

2. Target ID: Healthy cells display yellow MHC-1 markers. Infected cells have LOST these markers. Target them only!

3. Viral Spread: Every few seconds, a healthy cell becomes infected. If the total number of infected cells reaches 20, the tissue is lost.

4. Difficulty: In Hard Mode, healthy and infected cells look similar—you must rely purely on the presence of MHC-1 proteins.