The title really says it all. What's a good size for a vent for people to crawl through?
And also I want to make a secret area, like a wall that looks solid but you can walk through it, and hit a button that causes music to start playing. How would I do that?
If the vent's smaller than the above you could also use some grease smeared all over your player with a trigger that will cause a func_door to act like a ram rod and shove the player into the hole - of course it will probably kill them - but if you're not worried about that sort of thing - I'd say it's a go!
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