How do I unlock the true ending?

To unlock the true ending in Animal Hospital Anomaly, you need to complete several requirements beyond simply surviving all 10 nights. Collect all hidden medical records scattered throughout the hospital — these tell the story of what really happened. Find and enter all secret rooms, which often require specific keycards or items. Complete all badge challenges, which test specific skills like surviving certain anomaly encounters without hiding. Finally, complete a special sequence of objectives that becomes available only after all other requirements are met. The true ending reveals the full backstory of the hospital and its corrupted staff.