im pretty new to the new hammer of source, i have only used hammer for counter-strike mapping in the past, and i have seen a few tutorials online about how to make your first hl2 map, but i want to make a hl2 deathmatch map, or more specificly a co-op, you know with the monsters already in the level and you have to kill a certain type of them to get into the next room. Do you guys know of any tutorials or such to help me? thanks!