L4D Level Design/Outdoor Levels - Valve Developer Community
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A message like this would've made some people disappointed, but the majority of the community would've understood. It's an act of good faith Valve could've taken. Some people are overacting, as always,
VHE] Valve Hammer Editor Video Tutorials 2 file - Goldsource Data Base mod for Half-Life - Mod DB
L4D Level Design/Panic Events - Valve Developer Community
Left 4 Dead Authoring Tools released to undead masses
Valve Hammer Editor - Setting up Hammer for Half-Life Update - YouTube
Left 4 Dead Authoring Tools
Left 4 Dead - Wikipedia
Valve's Hammer Editor Logo by SpAMCAN0 on DeviantArt