Do you by any chance know if it was an original engine or based on one of those "make your own FPS" programs? Was it pure 3D (Quake, Half-life, etc) or sprite-based (Doom, Heretic/Hexen, etc)?
Do you remember the nature of the puzzles? Were they all "find the item needed to fix the switch needed to open the door", or did some perhaps open up sub-screens/minigames? Was there an inventory?
What about actions that would be considered non-standard at the time? Jumping, alternate modes of fire, special powers, blocking, etcetra.
Game modes/types, too, if you can recall any - multiplayer, character select, difficulty modes, notable features of the options/config screen, that sort of thing.
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