Assassin/Avenger
I've enjoyed these so much, I'm not sure why they never reached a larger audience.
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One thing I really like is that there's no 'do you have item x, if not game over' moment. Having certain items or skills makes your life a lot easier, and you can definitely box yourself into a point where a lack
Really enjoyed your write-up of these Way of the Tiger books. They were always head and shoulders above any other series I played so I'm also a bit surprised at their lack of renown. The sense of progression and the world around you were so good. The only other series I remember trying to do this was Lone Wolf and that was a lot less complete. Read somewhere (potentially earlier in this thread) that the whole setting of Orb was one they'd developed over a few years of D&Ding which was why it worked so well. On the other hand, it could be that the idea of an ongoing series is what put people off picking up a random one like you could with FF.
I really liked the same authors' sci-fi series, but that seems more of a niche thing. Think it was called Falcon?