Back 4 Blood proves Valve carried Left 4 Dead

“Bringing Left 4 Dead into your marketing mix also brings in the expectations of Left 4 Dead, thus opening yourself up to a lot more criticism.“ - Adam Sessler (G4TV) All B4B gameplay is patched and recorded post-launch. All L4D1 clips have been recorded on the original L4D. L4D2 modding tools released one month after launch: L4D1 modding tools open beta released six months after launch: