HL1 Coop, -Singelplayer Modification - We wrote the year 2349, where only a few human beings live on earth. Since the great incidence, where a group of scientist have opened a portal to the fourth dimension, since then creatures threaten the earth and completely want to destroy our planet...
Good mapping and coding, but the mod is extremly hard. A lot of places with endlessly respawning enemies and same time with poor weapons' placement. Moreover cheats are not working, so you can easily stuck, if you out of ammo. Some puzzles are difficult also and only walkthrough can help you.