The Imp said:
1. There are no Zombies in Left4Dead. Even the developers said their monsters are infected humans.
2. What is a "Gamescore"?
3. No, never, under no circumstances what so ever are cheats, exploits or glitches okay - at least in a MP game.
You are mixing up Left 4 Dead and 28 days later, that was the film where they very annoyingly refused to call the zombies zombies.
Think he means gamerscore. Something stupid on Xbox Live. It's inversely and exponentially proportional to your testicle size. Though too many Xbros seem to think the opposite.
Rocket jumping started as an exploit. Many of our most beloved game mechanics are born out of glitches and exploits. It's whether they survive patches that counts.
What is NOT acceptable is violating Wheaton's law: being a dick.
So cheating is almost always out because it is unfair, but if you are all agreeing on cheating in the same way (literally, the cheats menu like low gravity for ALL). Then again I wouldn't even rule that out, Imagine a game mode where it was something like 12 vs 1, and the one person had loads of cheats on but was fighting against 12 people.
That's a new game mode I've seen in a few places.