Medal of Honor: Allied Assault
respect...that game was UNFORGIVING. sometimes there'd be stuff say in kitchen or in shop by coast that you needed MUUUUCH later and if you didnt have a save going all the way back...tough.
Thats what always impressed me with Monkey Island..you could never get "stuck" so that you had to load a save.
But yea, learning spells was cool.
and fuck that cat...seriously.
Whew, it's a very tough question! I wish I can remember. I remember playing all those cga games for instance but can't remember names or which one I finished.
I'm going to go with Space Quest. It was probably one of those Sierra games that I finished first.