That is, Doom, the Roguelike.
Yes, DOOM, one of the best known original 1st person shooters. Yes, as a Roguelike, like ADOM or Nethack.
That said, it works surprisingly well: it’s a shorter roguelike (which I much appreciate given the finality of death in these types of games), easily completable over the course of a couple of hours, even if you are being cautious (unless you take the Angel of 100 challenge, of course). It is extremely light on exploration and experimentation (all items are pretty much identified and you really can only explore the current floor) but favors more tactical thinking (limited resources: unlike most other roguelikes, you cannot regenerate damage and with highly limited inventory space (20 slots) managing one’s inventory is extremely important, ESPECIALLY since you cannot go back to previous levels and as such cannot keep a stash) and risk management.
The interface is pretty simple as well, with far less commands than other roguelikes.
Like I said, despite it’s simplicity (in almost all areas: inventory, maps, combat, etc), it leaves a lot of room for tactical thinking and decision on how you will enter or resolve situations: Hell Arena is coming up, do you have the resources to handle it? Should you pass up a hard encounter despite needing the experience. Can you split up the encounter or just fire blindly into the darkness and hope you get them before they come to you? Can you REALLY take on four arch-viles (hint: no)?
StarStorm, Mancubus Warrant Officer, [3/3/2/0/0]

(2 floppy disks!!! xD)