The Unofficial Patch is a combination of the default Basic Patch which mostly fixes bugs only, and the optional Plus Patch, which is kind of a mod adding various tweaks and implementing a lot of unused content, including new quests, levels, weapons, items, characters, dialogue, graphics, models, sounds and original music! Included are also the optional Patch Extras which feature Player Mods, like shaders suites, as well as Developer Tools, like the Unofficial SDK to mod the game.

Bunnygod says

10/10 - Agree Disagree

I love the dedication for an older game. Keeping the past alive. Appreciate all the hard work! You put the AWESOME in AWESOME SAUCE! You have renewed my playing experience and my faith in people!