have you tried...

[TamAlthor]

So I rememeber mike booth in an interview talking about how the begning of the idea for l4d came from messing around with CSS and having one or two armed guys again a stacked team of bots with only knives. I've been messing around with that all evening today. It is a riot. It just makes me want l4d more. If you're gunna try it i suggest doing a bomb map, especially if it is one you have never played. go ct, put one bot on your side and then max out the Ts with expert knife only bots. Fun stuff there. add in dark, and scary music and boss zombies, oh man this is gunna be so much fun

Ya'll have prolly tried this a while a go so forgive me if this is redundant :P

[No Shelter]

Yes, lots of fun.

[CrossSilver]

I was surprised when mike booth said that he got the idea from CSS because the game really looks like what they shown in 28days later

[MadMan]

I've been doing somthing diffrent...

Get garrys mod.
Build your self a few rooms or just use hl2 maps...
spawn hl2 zombies everywhere
Fight your way through on online play

Heaps of fun.

I usally have about 60 zombies befor fps drops to an umbearible level

I was goona post a game save of garrys mod i have with one of the zombie levels i have but seriously.. cbf lol