Red Letter Day is the level that immediately follows Point Insertion in Half-Life 2 and introduces the player to Alyx, Dr. Kleiner, Eli Vance, and of course Lamar. The level in Left 4 Dead 2 quickly whisks players through the secret lab area and into the following hectic chase through the Route Kanal, just like in the original game. Instead of the Combine, though, players will have to deal with Left 4 Dead 2's variety of zombie archetypes.