So, i played L4D2 since yesterday... i love to be Nick.
So, i noticed it haves all the L4D weapons plus the new ones.
Customizable weapons: Incendiary ammo, Explosive ammo and laser sights.
Realism mode: It was okay... cept that the Witch kills you in one hit, also there are no blue teammates silhouettes and literally stuff that make it more hard.
Scavenge: Havent tried this one...
Survival: Its just like L4D survival. Same for Versus, i love to be the Spitter and Hunter.
Also, on first campaign, second map, you will stuff bricks when you enter a certain store.