Some knobs are red and green and others are grey or rusted over.
Guess which ones you’d be able to use.
Bitch, please. If you’re going to be elitist, atleast know what you’re talking about.
Because only veteran gamers have the technical know-how and experience to spam the use button on every available object. The mechanics of old school adventure games have nothing to do with half-life at all.
Good read! No new info, but still worth it. 
I think the last time I played a game that involved mashing the use key was Wolfenstein 3D…to find all of the secret rooms. The doors, however, were fairly obvious in showing if you could open them or if they required a key. Maybe they should have just made all of the doors look the same and not give any idea that there are keys in places.
Mods - Good job…still lurking.
poof
i second that… make openable doors and locked doors/doors which are only ‘‘decoration’’ undistingiushable.
and the same with the most other objects…