Press esc and go to save game. It's the same as in half-life. I don't think you can save the game when your online if that's what you want to know.
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if your talking about the gmod that you buy off steam, nothing game wise oh, and $10
Gmod is a sandbox game based on the Half Life 2 engine. Unfortunately it is impossible to get rid of the scripted entity limit on Gmod as it is built into the engine.
No. Gmod is only for PC
no. gmod is only for the pc.
When you are at the steam store you can select the game and it will tell you its size.