Det har talats en del om den kommande No Mercy-banan i Payday: The Heist, utvecklat av Overkill Software. Denna har beskrivits som en prequel till Valves Left 4 Dead, men så är inte fallet menar Valve.
"This is a 100 per cent Overkill made mission for Payday: The Heist simply set in No Mercy hospital from the Left 4 Dead series," berättar Valves Chet Faliszek för Kotaku.
Valve beskriver No Mercy mer som ett lättsamt samarbete utvecklarna emellan:
"It is not telling the origins of the Infection and is not canon. There is a little cameo from one of the L4D characters (the comic should give you a hint) and a fun little Easter Egg with a payoff later in Left 4 Dead. Just us having some fun with a studio we are friends with and who have also made a great co-op game."
Youtube-videon med banan, numera borttagen, beskrevs så här av Overkill:
"Have you ever wondered how the Left 4 Dead series began? It started with a heist!"