Simple (or maybe not that much) modding.

RSS Reviews
3

Hard Doom

Mod review
9

Black Mesa

Mod review

+ The physics of this mod are definitely worth it! Aside from the overhaul of the textures and models, there are a ton of new elements that blend in nicely.
- The AI of the soldiers is strange, and it feels like the weapons are weakened a bit too much to make the game difficult.

8

Shift-Two

Mod review
9

Portal: Prelude

Mod review
9

Half-Life Invasion

Mod review
6

Generals Classic

Mod review
10

C&C: ShockWave

Mod review
2

Half-Life Lands of Lore v2

Mod review
1

The First Tiberian War

Mod review