Mira HQ is an Impostor's paradise due to its extensive vent system and lack of cameras. Your mobility is your greatest asset.
Early Game (First 1-2 Minutes)
Fake a task in a busy area like Admin or the hallway. Look for isolated Crewmates in Reactor, Lab, or Greenhouse. The decontamination corridor is an excellent kill spot if you can catch someone alone. After a kill, use the vents to quickly traverse the map to a distant location (e.g., kill in Reactor, vent to Balcony) and walk out, establishing an alibi. The Admin door log can be a double-edged sword; use it to your advantage by faking movement or avoid areas where you might be logged suspiciously.
Mid Game (After First Report)
During meetings, use the lack of visual evidence to your advantage. Blame others, especially those who were near the body or who have weak alibis. Sabotage lights in Reactor to create kill opportunities in the dark. Use Reactor or O2 sabotages to force Crewmates to specific locations, then vent to those locations for kills. The interconnected vents allow for rapid repositioning after a kill or sabotage.
Late Game (Few Players Remaining)
With fewer Crewmates, your vent mobility becomes even more powerful. If you're the last Impostor, use critical sabotages (Reactor/O2) to force a win or create a final kill. Be extremely careful with venting; at low numbers, being seen venting is almost certainly a loss. If you get a kill, consider self-reporting if no one is around to control the narrative. The decontamination corridor remains a strong kill spot throughout the game.