The last mission and boss + the ending for Painkiller Overdose for PC. Painkiller is sorta the serious version of Serious Sam. Painkiller overdose has more serious and scary monsters and the levels are much more darker in colors compared to Serious Sam. The game's gameplay works just like Serious Sam, you get into 1 room/area at the time and must kill every enemy before you can proceed the the next room/area. Painkiller Overdose is a pretty cool game, but i do like Serious Sam better due to its more variations of colors. But if you like Serious Sam or FPS in general, you might want to check out Painkiller Overdose. There is also a demo avalible.