Editing Killing Floor (modification) (section)

===Major changes===
*There was a campaign in 1.0 and a story map for 2.11 allowing community co-op for the 1.0 story mode. 
*The [[Patriarch]] was only officially added in the retail version. For 2.51, he was added in as a community patch as for 2.5, he was not in for being too 'glitchy'.
*There were no [[Chainsaw]]s after version 1.0.
*[[Perk]]s have different bonuses and requirements.
*Perks have no levels.
*The [[Trader]] was found at only one place in the map.
*The scoreboard followed money held and current health percentage, not kills or health status.
*5 specimens were removed.
*Art style is slightly different. The retail version has a more realistic-look.
*The [[Handcannon]] does not support [[dual-wield|dual-wielding]] in the mod version.
*The [[Handcannon]] was a weapon for the support perk. (The Handcannon is for [[Sharpshooter]]s in the retail version.)
*Each weapon has its own type of ammo pickup, and you can also find frag grenades. In the retail version, one ammo pickup will restore ammo for every weapon and can sometimes have a grenade inside of it.