The harbinger of adventure games to come, the King's Quest Series provided unique puzzles, mythical settings and out of the box thinking to solve certain puzzles. I would consider these the "Mother Goose Tales of Video Games," as this is where many of us older games cut our teeth, and there's a surprising amount of fairy tale and legends embedded into each.
Why not revisit your gaming childhood or introduce those in your family that are just starting?
King's Quest 3 was one of the first games I got for the Tandy 1000SX, and I spent countless hours working under the oppression of Mannanan. I still have box on my bookshelf, even though I no longer had the PC slow enough to run it on. One touch, one whiff of the manual, and I'm back in 1986 again on a wintry Sunday afternoon.