Nihilanth's death stopped any future alien attack on Earth. But after some time, there raised something more evil. It was called Mother of Headcrabs. This monster started creating more powerful headcrabs, than anyone could imagine. There was a lot of varieties and different specialities. They were true warriors, really strong enemies... - By Michal Jirouš.
This review may contain spoilers
The Nope-Crabs mod, kill every nope-crab in your way with a deagle and a knife! But wait... there are even Nope-Zombies.. and freaking Nope-Slaves! Why not find and use the Anti-Nope Guns? This hardcore mod was the best Half-Life mod that I've ever played in my entire life! This is officially in 1st place of my best half life mods list! If you want to play this mod as a real adventure, buck off the cheats... sv_cheats 0 if you want to experience a good half life gaming. This mod would even be better if there were even more levels (But okay 9/10!) I've beat this game in 3 hours! First when i saw this mod, read It's description, i thought sure.. new playable maps with headcrabs that deal more damage.. BUT!! After i kept playing it just got better and better. More types of headcrabs and more maps would totally make this mod a complete hardcore game!