Never played the Serious Sam games before besides a very short five minute session in "The Next Encounter" when I was a kid on my PS2. How the fuck did I not know about Serious Sam? I'm a huge HUGE Doom fan, or fan of old school FPS in general, this is like Doom Eternal in 2001! I had so much fun with Serious Sam and if you are a fan of old school shooters and haven't played this, YOU'VE GOT TO.