Corridor 7: Alien Invasion (GOG)

A Martian artifact turns a sealed research complex into a breeding ground for an alien invasion, and the only answer is to go in armed and start clearing rooms. Corridor 7: Alien Invasion is a hard-edged, early-1990s first-person shooter built around claustrophobic corridors, locked security zones, hidden dangers, and creatures waiting just beyond the player’s view. Its setting has the blunt, pulpy appeal of old sci-fi horror: sterile laboratories become hostile territory as a dimensional gateway floods the base with extraterrestrial monsters. The mood is tense rather than cinematic, relying on darkness, maze-like layouts, and an ominous soundtrack to make every unexplored passage feel risky.

Players take control of a Special Forces operative and fight through 46 levels drawn from the expanded CD-ROM release. Progress means scouring each floor for keys, access routes, switches, supplies, and the exit while managing enemy ambushes and environmental traps. Nine weapons give the combat a satisfying old-school escalation, beginning with basic firepower and growing into more destructive tools for tougher alien opposition. Special equipment adds a welcome tactical wrinkle: night vision helps navigate blacked-out areas, while an infrared visor exposes threats and hazards that ordinary sight can miss.

Corridor 7 stands apart from other shooters of its era through its sci-fi laboratory atmosphere and its willingness to make visibility part of the challenge, not merely a visual effect. The maze design can feel deliberately punishing by modern standards, but that is part of its appeal for players who enjoy mapping spaces, hunting secrets, and surviving with limited information. A repeatable Presidential Level adds an extra reason to return, changing its arrangement between runs instead of serving up one fixed finale. Fans of Wolfenstein 3D, Blake Stone, and other formative DOS shooters should find plenty to enjoy, while newcomers should approach it as a historical action game whose rough edges come bundled with genuine arcade tension.