[hlcoders] SP mod without Half-Life 2?

[Jack Steele]

Hi HLCoders,

I own Half-Life 2 Deathmatch and have made Half-Life 2 multiplayer mods, 
and I would like to make a singleplayer mod with Source.  I own Portal 
and Half-Life 2 Lost Coast.  Do I need Half-Life 2 to make a 
singleplayer mod?  And if I do, which games do I need?

Thanks,
Jack Steele

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