… there's a Hard difficulty?! (And I've had trouble with the starting difficulty.)
Well, at least you don't have to pay EXP to start the tower all over again.
From my own experience, the game isn't too tough until you reach Armed Train Irving. That said, you do unlock Hard difficulty by beating the game once. Beating the game on Hard Mode unlocks Nightmare Mode.. As for the Boss Rush, all boss refights are Lv: 50 so I'm definitely not strong enough to take them on yet.
Thank goodness for that. I'll definitely need to level grind eventually once I reach the higher levels of Vambury Tower.