I remember there was a mission pack for the game. This package added three extra-missions to the first original game. Why is it not included?

I don't own the gog version of splinter cell, but this works for the steam version:

http://forums.steampowered.com/forums/showthread.php?t=1912003

give it a try and tell us if it works.

Great news that it is included, but I think you ought to advertise this fact more prominently as I wasn't sure from reading the game description.

It's not like you're missing anything from the pack. The levels weren't very good.

I second that. It is a clear advantage over the boxed retail version, GOG should mention it on the game page. This mission pack was a PAIN to find back in the day.

Also, don't listen to the other guy, the bonus missions are good. :)

I wouldn't say 'good' but they certainly are 'ok'.

Great! Thanks for the reply!

I agree it should be mentioned, it's definitely an additional selling point, so why not? It's actually the reason I even checked the forums. I wanted to know because I lacked it, and even though I already own the game this makes me consider re-buying it on GOG.com. As someone already pointed out, the basic game itself has been re-released to death, but the mission pack was quite a rarity.

I'm a completist, as I'm sure many other GOGonauts are, and having all the official stuff included with the release is one of the many reasons I love to buy from GOG.com. Seems silly not to show it off on the product page :)