For the next few days, GOG is offering up the Eye of the Beholder Trilogy which includes Dungeons & Dragons: Eye of the Beholder, Eye of the Beholder II: The Legend of Darkmoon, and Eye of the Beholder III: Assault on Myth Drannor.
These are are some old-school titles with the original hitting PCs in 1991 and the last in the series in 1993. You want to be transported to a very different age of gaming this trilogy is you chance.
These games are first-person, real-time role-playing games and are as charming as they are difficult. One awesome feature is that you can transfer your party across all there games, meaning you can truly live out a grand adventure across the ages.
And because these games were so heavily reliant on the game manual to give you lore and backstory, GOG includes all the original manual as well as a clue book to help you if you get lost.
Find the trilogy here: https://www.gog.com/game/forgotten_realms_the_archives_collection_one