Rise of the Triad: Dark War [GOG][Linux]

https://www.gog.com/game/rise_of_the_triad__dark_war

You are part of an elite group of operatives called HUNT (High-risk United Nations Taskforce), and you must stop a maniac cult leader from killing millions of people. While scouting a remote island, you are suddenly surrounded by enemy troops with guns blaring. In the distance you see your boat - your only chance to escape - blown to matchsticks. In front of you is a huge fortress monastery, and your only chance to stop the madness.
You are equipped with awesome, high-tech weaponry like heat-seeking missiles, split missiles and the Flamewall cannon, which leaves a trail of charred skeletons in its wake. It's your assignment to annihilate and destroy - to ensure peace on Earth.
Experience the zany and overly brutal classic FPS action only a game from the 1990 can deliver!

- Includes Extreme Rise of the Triad add-on pack that features 42 additional levels to play!
- Old-school first person shooter with an arcade feel
- Fire, explosions, gore and gibs all over the place!
- Cool weapons, including the drunk missile launcher, Excalibat and the Hand of God