That many! Jeepers.
523. ...When you haven't played it for years you still remember all the endings, all the alien evolution bits, and all the default locations of the different areas, and which items you would find in each area.
That was one of the strangest things with that game. You couldn't live on Notrium for more than a couple of days without knowing a lot about it, but people didn't mind at all. Well I guess a lot of people never got far in the game, but those who did never complained about it being hard to start.