Killing Floor has gained popularity without even being afraid of Left4Dead on the horizon. A great atmosphere and a realized idea is bearing fruit.
The graphics, of course, looked great for 2009, and even now it's not bad. Unreal Engine is not lagging behind! And what struck me was the good optimization on this engine.
The soundtrack in the game is not very good, which made me very sad. I was playing with my music.
The gameplay is convenient, simple, and there are no problems. A standard first-person shooter
In general, the game turned out to be great, and personally I spent a lot of time on it. It's true that it's boring there alone, but when you have a team ... then heads fly off your shoulders!

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I am a 45 yo father, probably one of the oldest people playing this game. I am a single farther to my Son, who is 14 now. My son got this game for Christmas in 2021 from his uncle, so we installed it on his computer and he started playing. By the end of the week he had 24 hours on this game. This was horrible for me, as it was already hard for me to find ways to spend time with my son, as he is always out with his friends or just watching YouTube. So I decided to make a Steam account and get this game to see if I could maybe play alongside him. I loaded into the game, picked my character and started playing but I was stuck on what you where supposed to do. I asked my Son for help and he hosted a game for me to join. I loved it as it was the best time I had spent with my Son since my wife had died. This game has ever since brought me and my son closer again and now we actually spend time together outside the house together as well. This game reminded me that there's fun to be had in everything, and it has brought both me and my Son many happy memories.

Better than KF2