Underhell is a Half Life 2 Modification developed by Mxthe in collaboration with We Create Stuff.
Underhell Prologue requires a Source Engine game to run, and Source SDK Base 2006 installed.
Underhell Chapter 1 will require a Source Engine game to run, and Source SDK Base 2007 installed.
After 3 months of being quiet, here is the first Gameplay Video of Underhell Chapter One, showcasing the sneaky and infiltration gameplay aspect of the game.
1 : None of the AI behavior is scripted
2 : The Dynamic Music is entirely in game until the final montage.
3 : It is still a work in progress.