The Swordquest series isn't super remarkable if you go into it without any context or instructions, but if you know the history of how these games represented a sort of "treasure hunt" contest for real life, I'd say they're really neat, ingenious, ambitious, and ahead of their time in that respect. Swordquest arguably pioneered the concept of an "ARG" in a sense, as the game required players to seek clues outside the game to put things into context and solve its cryptic puzzles.