holy shit you are a genius, yes, I talk about games that a small amount of people have played.
Defcon 5 is a first person person shooter game, although you won't be doing a lot of shooting unless you like being trapped in rooms (more on this later). The first thing you'll notice about this game, if you bought it for the ps1, is the size of the box its in. It is literally twice the size of a normal ps1 container, I can see no logical reason for this.
Onto to the actual game, you are a "cyberneer" (oh 90's how I miss thee and thy rediculous names), and you are supposed to defend the space mining installation from attack. How do you do this? By setting up little defense drones around the installation, you do this by interacting with an overly complicated (for my 8 year old mind anyway) computer system. If you attempt to go and shoot the baddies personally, guess what, the fucking air become contaminated or some shit and the doors in the are become locked. Many Rage induced blackouts were had.
Oh shit what are you doing don't shoot it oh god WHY
Oh also the installation you are defending is 2 towers that are each seven floors tall and each floor is fucking huge, so you better get to memorizing each floors name and location.
Hope you like getting lost in corridors
Overall this game isnt too bad, aside from the clunky controls and the crazy computer interface, the game can be quite fun defending the giant ass facility you are stuck in from invading robots, just make sure you don't get lost, 7.5/10, would play again