A really fun addictive game.
The gameplay is basically based around Sam roaming levels killing demons and monsters and trying to reach the main goal of the level, most of the actions you do determines your score at the end, for example creating a row of kills without stopping you will gain a lot of points. Points usually lead to an award of some sort, obtaining awards isnt possible on easy mode as it states. Playing Serious Sam on the easy difficulty isnt fun, it is way to easy and feels boring whereas playing through the game on hard is a lot more fun, it challenges you in the way of masses and masses on enemies, making it harder but in enables you to get tons more points and feels better to play in general. Each enemy have there own abilities, for example these guys with bombs on there hands will run towards you screaming as loud as they can and if they get to you in time they will blow themselves up dealing damage to you, another example is a monster that you come across on the 5th or 6th level, it is a huge red demon that shoots fire balls at you that can cause some serious damage on the harder modes. Serious Sam features a range of weapons including Shotgun, Uzi's, Rocket Launcher, etc, oh and the trusty chainsaw. Aswell as all these weapons and enemies, you can collect all sorts of power-ups in game such as health power-ups, armour, ammo, and often you come across secrets which are basically a hidden room full of ammo, treasure and power-ups. Overall the gameplay is highly addictive and really fun to play.
The graphics are reasonably good, there not the best but there good. Each level does have a great layout whether it be a huge field with trees and random houses to a roman palace filed with glistening water and huge statues, so the levels do vary graphics wise. As for the blood that comes out of the enemies when you shoot them, well its not that great, its just a few simple particles, but Serious Sam was never intended to be a bloody gory FPS.
Sound in Serious Sam is good, but most of the time you cant hear anything as the screaming bomb men are running towards you, im only joking but they are pretty loud. Nothing spectacular about the sounds, and if I remember there isnt any music which doesnt give the game any favours.
Overall Serious Sam is a general fun addictive game to play, it seems more of a game you will play on at the arcade rather than a FPS game, great game.