In Two Dark, the players play as a Mages or a Warrior, who have to find their way out of a dark procedurally-generated dungeon. To achieve it, each player have a torch which serve to illuminate around them and reveal the monsters hidden in the darkness. Both players have to cooperate to share their field of view.
The torch represents its owner's life. When a monster hits him, the radius of his torch decreases. Obviously, when the light passes away, he dies.
The monsters randomly loot pick-ups that players can gather and use later. There are several monster types, so the players have to be carefull of their patterns. They also have an "heroic bar" which is filled by killing the monsters, when it's full, the players realease an heroic capacity which deals a large amount of damage to monsters in range.