Not sure about the young'ins, but anyone whos older then say , 18, might remember the huge flood of ultra-violent, ultra-funny FPS games, such as Blood, Shadow Warrior, Duke Nukem 3D , Doom series and the like, and the parent committies and do-gooders crying and whinging for 3D realms to be shut down because the games 'desensitize children'.

Unfortunately, even now, such games havent become freeware (theres trial shareware available), and they're imposible to find on the shelf in shops.
Those were the days....when a storyline meant nothing, and killing mindlessly and your 'hero' spurting out crack one-liners was the best

I never played Shadow Warrior , though I played everything else. I'd have to say Duke Nukem 3D was the worst of them (especially the 'raw uncut' version (evidently become the first R18+ game))
This '3D' type of gaming was revolutionalized by Half Life.