i didn´t know the game until this year, as i found it on gog. downloaded, installed, played. first on normal difficulty. i have played many fps shooter in my life. many. but only VERY few are as good as this one. this is a classic straigt forward shooter. no fancy stuff. hard, long and very good story. the weapon system are well designed, the levels (6) are very different and the story (especially the end !!!) is very good. the story of the game has a main message which is more topical then ever. about the difficulty: the game is hard but fair. if you are a normal skilled player then the game is absolutely no problem for you. i finished it on "normal", and it was no problem to do so. now, i replay it on "realistic" (the hardest of the 3 difficulties) and it´s not that hard. ok, you must aim on the head before shooting and in some cases you must know who the guys are (hidden sniper) but thats it! the game is also long, you have 6 very different areas/levels. it´s a long time ago that i had so much fun with a shooter. 110% oldschool. if you are not a shooter noob and you like hard shooters than you will love this game -believe me. watch youtube vids before buying and everything will be fine. for me i can say: i will replay this game in future years many times. this is one of the games you can replay for the rest of your life. :-)