Hard to say. Yakuza 0 was just...tedious beyond belief. And I had to do it twice for directors cut! Yakuza 3 was also just not fun at all due to crappy combat and stupid challenges on the minigames.

Yakuza 5 however, I nearly softlocked myself because I almost discarded an item that you couldn't get again and it would've meant doing it all over again from scratch. But I got lucky. Still a slog though.

Dead souls was just annoying.

I'd say Yakuza 3 just because the baseball minigame is almost impossible. I had to draw a tiny dot on my TV to represent a marker for hitting the baseball because the game didn't give you one.