The game has four maps: Space Ship, Skyscraper, Polar and Airship. The crew has to complete tasks on the maps in the form of mini-games, which include maintenance work on vital systems, such as rewiring or refueling engines. Intruders are given fake task lists to blend in with the crew, and can identify other intruders and have the ability to sabotage map systems, traverse vents and kill crew members. If the player is killed by an impostor, they will become a ghost. Ghosts have the ability to pass through walls, but can only continue to interact on the map in a limited way, and cannot be seen by any other player except the dead player who turns into a ghost. All players except the ghost can only see a limited distance.

Crew members need to complete all missions or find and destroy all invaders to win, while invaders need to kill a certain number of crew members to make the remaining number equal to the number of invaders or sabotage the countdown to win, and ghosts complete missions or sabotage by assisting their teammates who are crew members or invaders. When an intruder engages in sabotage, either the effect is immediate (e.g. turning off all lights) or the sabotaged facility will start a countdown and if the crew does not solve the facility before the countdown ends, all crew members will die and the game will end.

If a player finds a corpse, they can immediately report it and force all players to attend a group meeting to vote for the suspected intruder. Players can also press the "Emergency Meeting" button on the map at any time to convene a meeting.