As we know there are thousands of things you can do in Garry’s Mod, which includes mini-games.
That’s the Garry’s Mod wiki link to a list of mini games you can play in Garry’s Mod Sandbox.
I have only one to share as I am not creative.
Sawblade Darts
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Make a target on the wall using your rope tool. Make it very large and visible.
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Make smaller circles or squares inside of your target using the rope tool.
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Spawn a sawblade.
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Shoot sawblade at target with Gravity Gun.
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Play with friends
What Gmod mini games keep you occupied FP?