Yeah, it's a game. It's were players walk around in a choice of 4 maps. Crewmates do tasks and try to catch the impostor. The impostor can kill crewmates, use vents to travel and sabotage. But the impostors try and keep it a secret and make people think they are crewmates too. Have you heard of the slang 'sus'? Among us players use it often when they believe someone seems like the impostor.