I support the Quest for Glory and Gabriel Knight I recommandations.
Also : Loom, Death Gate, Mission Critical, I Have no Mouth and I Must Scream, Shadow of the Comet, Prisoner of Ice, Lure of the Temptress, Les Voyageurs du Temps (I guess it's Future Wars in english ?).
And many more, but that should already keep you occupied for a while hehehe.
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