Ever wanted to know which games garry's mod 13 support? Well, I heard lots of peoples say "Why don't this game work on gmod!!!"... Well I tried with minecraft mounting to garry's mod 13 too. It didn't work. Then I realised, a friend sent me a list of games that garry's mod support. (as of version 13). Here are those games:
Team Fortress 2. Free On Steam
Half-Life 2 (Episodes One, Two, Half-Life: Source, Half-Life Deathmatch: Source, Half Life 2: Lost Coast, and Half-Life 2: Deathmatch are also supported)
Portal 1 and 2
Counter Strike: Global Offensive
Day of Defeat: Source
Left 4 Dead 1 and 2
Zombie Panic: Source. Free On Steam
Alien Swarm. Free On Steam
Dystopia. Free On Steam
Age of Chivalry. Free On Steam
Pirates, Vikings,and Knights 2. Free on Steam
D.I.P.R.I.P. Warm Up. Free On Steam
INSURGENCY: Modern Infantry Combat. Free on Steam
Well, that are these games. Most of people say "ONLY?!?!?!?!"... I know, garry should've make support for other games, like: minecraft, mintest, starmade, Kerbal Space Program etc.
-First, navigate to your steam folder.
-Go to "steamapps" folder.
-Go to your "common" folder.
-Navigate to "Garry's Mod" folder.
-Go to "steamapps" in "Garry's Mod".
-Click on "common" folder.
-Put content from these games (listed above) in that folder.
You're done mounting ;)