i beat it in 16.5hrs on normal. it seems like a long game. but if you upgrade your weapons properly then the final boss isn't that bad. don't waste time with upgrading weapons that you don't /won't use. the crystals were a nice touch to the gaming experience. The BFG is back and has 3 versions!!! super sweet! I don't know the God mode code...so don't ask. LOL! A couple of the characters are very, very, very, difficult to beat at first until you discover how to use the crystals properly. (don't wanna give away too much). it keeps the original scope of the game in mind, but you are exploring a multi-level/multi-stage map. some things you cannot get back to after you leave the areas...so be sure to explore the areas before you leave thoroughly if you are seeking 100% completion in the game. the game has lots of shooter action. you get to control lots of nest guns. they throw lots, and lots, of enemies at you all at once. pick and choose your fights and seek cover. if you are an all balls in everywhere you go barn busting shoot em all at once rogue player - you may have a hard time completing this one. i had to constantly seek cover. sometimes you get help in this one. you are not always by yourself...COD upgrade. nice! sheilds! ...halo upgrade. wow! once you have the 2nd or 3rd crystal you can use sheilds. it helps in ambush situations so you can run for cover. i had trouble with 3 of the main bosses, but eventually figured it out without any walktrough help online. i missed a lot of little stuff. after the credits scroll for about 20min....jeesh....there is a cut scene.....wolfenstein2???? i enjoyed the graphics and AI in this one very well. if you try to hide they will find you!!! i found that the graphics get choppy and seem to allow you to get stuck in some places, but don't keep you trapped to the point you have to restart the stupid game. the german attack beasts near the end sometimes don't move very fluidly, but move very fast to claw the crap out of you. and if you don't like them.....wait til near then end when they kamakazi you with explosives strapped to them. holy christ they suck! can you say Fire, Fire, Fire - hint, hint. Anyways. Good game. Just long enough not to be annoying, but unlike DOOM3, this game is long enough and detailed enough to keep you going. DOOM3 was too damned short if you ask me. constantly checking/reloading/and collecting your favorite ammo is key. they don't always give you what you want and you will run short sometimes. you will also like the sneak attack mode. have fun! i did ... 8.25 of 10 overall. boss fight difficulty 8.5-10. graphics and fluidity of game 7.5 of 10. fun, addictiveness, and playability 9.5-10.