This mod improves the game graphics and gameplay. The mod consists 3 parts so users can install any parts on their choice. The first part includes a revamped game engine, provides dynamic lights of shootings, fires and explosions. Besides of this the new engine provides improved world details drawing so a picture becomes much detailed than with classic game engine. In addition, there is improved commanding of player's companions was added. Also this part includes the config files for optimal graphics settings. The second part includes some modified maps with removed the unlimited enemy respawn and modified gameplay. The third part includes config files to make the weapon params and enemy health more realistic and make the gameplay more interesting.
Vanilla game allows player to command only unnamed NPCs. Rivarez mod allows player to command all friendly NPCs includes Barney, Alyx, Vortigaunts etc. NPCs can wait the player until he comes back and call their to follow him.