Yep, earlier this year actually. I'm slowly but steadily making my way through the series game by game.
I enjoyed Felghana, some things more than VI, others less. I'm glad I played it on easy though
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Also fuck that snowy mountain, dungeon and boss.
While I'm definitely more of a casual RPG player (story and ambiance over systems), truthfully, I must admit that these solo Adol-era Ys games sort of live and die by their dungeon design, though alas I can't confidently rank them against each other on that front, I'd have to play them back to back to even consider doing that, and even then I don't know if I'd be capable of digging into the nuances of that conversation.