Honestly if i say this is the first and only game in 6 mainline games of this Mega Man interation who forces you to clear the game at least 3 times with a "100%" or the most close you can get to it at each run to then allow you do a truly 100% of this game, i wouldn't need to say anything else if you played a RPG before or if you're insane to play this game too.
There are welcome additions expanded more later on at MMBN5 and MMBN6 (like the soul changes), but even those additions can't save a weak story which has three sections divided by a lot of "mini-stories" you can replay to 2 or 3 times in a row (at minimum), a weak gameplay too since Capcom nerfed a lot of things even if the Tornado combo starts here with Super Vulcan and Air Hockey folders being a thing in this game (and the story mini-games like Metalman rock breaking or Paule Water Maze puzzle which sucks without a Gamefaqs map), a weak map to the point even Undernet 6 ripped the same map from MMBN2 and above all, this game truly manages to show you why Mega Man Battle Network should've finished on 3 and everything else is canon fanfic or spin-off.
There are welcome additions expanded more later on at MMBN5 and MMBN6 (like the soul changes), but even those additions can't save a weak story which has three sections divided by a lot of "mini-stories" you can replay to 2 or 3 times in a row (at minimum), a weak gameplay too since Capcom nerfed a lot of things even if the Tornado combo starts here with Super Vulcan and Air Hockey folders being a thing in this game (and the story mini-games like Metalman rock breaking or Paule Water Maze puzzle which sucks without a Gamefaqs map), a weak map to the point even Undernet 6 ripped the same map from MMBN2 and above all, this game truly manages to show you why Mega Man Battle Network should've finished on 3 and everything else is canon fanfic or spin-off.