Play X-COM: Terror from the Deep Online

X-COM: Terror from the Deep came out in 1995, a follow-up to the original UFO Defense from MicroProse. It was a classic MS-DOS game that pushed the hardware of its time, demanding a lot from your computer and your patience. The game took the familiar X-COM formula and submerged it, trading flying saucers for deep sea terror.

You command a squad of soldiers exploring alien-infested underwater sites and alien vessels, one grid square at a time. Your main goal is to stop an aquatic alien invasion by researching their technology, managing your global bases, and surviving brutal turn-based combat. Key mechanics include managing soldier inventories with heavy diving suits and powerful but cumbersome sonic weapons, as well as navigating multi-level submarines and ruins where enemies can attack from any depth. The pacing is deliberately slow and the difficulty is punishing; a single misstep can lead to a full squad wipe. It feels like a desperate, claustrophobic struggle against an enemy you can barely see in the dark water.

Each game uses different controls, most DOS games use the keyboard arrows. Some will use the mouse , "Alt" ,"Enter" and "Space bar".