How do I find hidden rooms in the hospital?

Hidden rooms in Animal Hospital Anomaly require careful exploration and specific items to access. Look for walls with slightly different textures or discoloration — these may be secret passages. Some rooms require keycards of specific colors (white, yellow, or red) found in offices and nurse stations. Pay attention to environmental clues like draft sounds, air vents that rattle differently, or sections of wall that dont match the surrounding area. The basement and administration wing have the highest concentration of secrets. Certain anomalies like the Phantom Nurse can sometimes be found near hidden entrances, hinting at their location. Check behind bookcases, paintings, and in supply closets.