Dragon Quest II
Played this a while ago so this is more a collection of scattered thoughts.
We've evolved from the one-man party to a three-man party that are distant descendants of the DQI protagonist. We also encounter the descendant of the DQI villain and can later visit Alefgard, the DQI continent. The gameplay has also evolved! With more allies and monster groups, there's more flexibility in battle. We get to sail around the whole map and teleport.
My main memory of the game is when your team gets to Rhone, the last area of the game, the difficulty spikes tremendously. That's mitigated by a couple hours of grinding, but it was kind of demoralizing XD