"Zak" is a unique and outrageously funny gem; yes, after it, Lucasfilm produced more advanced and maybe better structured adventures: the Indy's series, Day of the Tentacle, not to mention the Monkey Island games. But, in my opinion, neither of them could recapture the atmosphere of Zak McKracken, its varied locations and puzzles, the charisma of those unforgettable "aliens" and of Zak himself. I can't wait to ride that bus to Mars again. Thanks GOG :)
Ultima Underworld 2, even nowadays, still tops my all - time favourite CRPG list (along with Ultima VII and Planescape: Torment) : it improves the first episode on every aspect, and it also ties-in more with the main Ultima storyline, unlike UW1. Immersion and general atmosphere are simply superb, probably its strongest points; finally, great gameplay and soudtrack, as well. Thank you, GOG :)
