The Metro series has traditionally deployed a pretty interesting system to help determine which ending scenes you ultimately receive. In Metro 2033, Last Light, and Exodus, Artyom would be awarded 'Karma Points' for actively and passively undertaking different actions – this is largely hidden away from the player, operating quietly in the background to help encourage you to better understand the Metro, its people, and the strange phenomenon hanging over it.
Metro 2039 is bringing players back to the Metro system after Exodus steered us into the wilderness beyond Moscow. There's a new protagonist, the Stranger, an exile returning to a world that's now under the rule of one centralized faction – the fascistic Novoreich.
