When Apocalypse Weekend was released as the add-on for Postal 2, it added the new Boomerang Machete, Sledgehammer, and Scythe. Unfortunately, the major complaint about AW was that the "free-roam" element from Postal 2 was gone. Not only could you not roam freely in AW, but you couldn't take these new weapons back to the original Postal 2 levels, either. AWP changes all that. AWP is an enhanced version of the original Postal 2 game and combines it with the AW expansion pack weapons and levels, plus tons of extra bonuses to make the ultimate Postal 2 experience. AWP adds tons of new features to the normal Postal 2 and AW games: Use AW's weapons and gameplay in the original Postal 2 levels New custom weapons, plus weapons from the hit mods Eternal Damnation and Improved "behind the scenes" game handling to (hopefully) reduce crashes Brand-new cheats, such as unlimited dog helpers and police-hating bystanders Destroyable doors for quick shortcuts More blood, guts,...
It improves everything from the original game.
Specially adding TONS of new weapons, but also including new items, features (like arcade in-game play), and even nice cheats to have some fun with!
No wonder why RWS made it an official upgrade. Highly recommended.