Guards hear your footsteps differently on carpet, tile, wood and metal grating, and noise carries through floors.

Light matters: a visibility meter shows how lit you are, and you can shoot out lamps or cut the power to a room.

Look before you open: the snake cam under the door, night vision and thermal goggles.

Non-lethal is the intended way through: silent takedowns, shouting suspects down, cuffing. Lethal force has consequences.

Being spotted escalates: guards radio in and the alarm climbs. You can cut their radio repeater so nobody can call for help.

You command a team, so stealth includes timing: stack on doors and use go-codes so everyone moves at once.