Half-Life Games You Didn’t Know

Half-Life: Decay

Decay is a co-op for 2 players very much so in the spirit of Half-Life: shoot and solve puzzles. Originally, it came out for PS2 and I didn’t hear about it until much later. It takes about 4 hours to finish.

How to play on PC?
Download it from Mod DB and follow this guide:
https://steamcommunity.com/sharedfiles/filedetails/?id=376774460

Half-Life 2: Survivor

Japanese arcade version of Half-Life 2 focused on combat. It has all the goods! Tutorial prompts! Cutscenes! Hit effects! Giant arrows! Bosses!

Wiki: https://combineoverwiki.net/wiki/Half-Life_2:_Survivor

How to play on PC?

Download stuff
Download fixed binaries Fixed Half-Life 2: Survivor Ver2.0 binaries by ben1066
Download content dump Half-Life 2: Survivor Ver2.0 Content Dump (torrent)
Download Source SDK Base 2006 via Steam (Library / Tools):

Download GCFScape (guide).

Extract content dump
Extract and place the content dump where you want your game to be.

Extract stuff from SDK base
Use GCFScape to extract materials, models and sound from SDK base VPK files in “C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base\vpks”

Extract materials from depot_206_dir.vpk
Extract models from depot_207_dir.vpk
Extract sound from depot_208_dir.vpk

Put it together
Move materials, models and sound into folder “HL2AC\hl2\”. Do NOT overwrite files.
Extract fixed binaries and move the content to main folder HL2AC. Overwrite the files.

Run it
Launch HL2Survivor_RunMe.bat.
Wait for the console commands to launch the game.
Press F1 to insert an imaginary coin and F2 to start the game.