I have played half of BG I (I quit because I had an old computer and the game kept throwing me out, showing me only half of areas, ..., so I couldn't go farther in the game). I got very disappointed then and almost resolved not to play BG II at all ...
I only played BG II because I had changed computer.
Now that I have finished BG II, I have started BG I again - hope I will finish the game this time !
Never played the other games.
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The world is my oyster !
And now I have the knives to open it ...