Contain the outbreaks before rooms turn critical
Reach the Terrace and inspect the paranormal portal to trigger the outbreak. The map shows haunted rooms changing from green through yellow to red as danger rises. Use that current map to choose your next destination. A room that reaches the critical stage starts a failure countdown, so do not spend the emergency searching every drawer for money.
Use the mansion’s E-Gates to shorten travel between the Nautical and Space Exhibits, Jungle and Ice Age Exhibits, Ancient and Dark Age Exhibits, then the Restrooms and Kitchen. This is a practical sweep, not a substitute for checking which room is closest to critical on your attempt. Clear a room fully before leaving so its marker disappears. Once the marked rooms are safe, return to the Terrace for the final waves. Deal with Hiders and projectile throwers before committing to a long capture on a large ghost. For this mission’s Boo, restore the missing hot-air balloon in the Aviation Exhibit before starting the portal event; the emergency is a poor time to make the detour.
Collectible checklist
Boo checklist — Aviation Exhibit: Before triggering the Terrace outbreak, reveal the missing hot-air balloon with Dark-Light.