In Thief 3: Deadly Shadows, when a city guard kills you for the first time you get sent to prison instead of dying. It’s a cool “bonus” level many players can miss because city guards are the easiest enemies.
I think it would be a cool idea if they gave other factions (Pagans and Builders) their own bonus levels
(Features*(IsOSS+1)*EaseOfUse)/(1+(Ads))
just my guess