I'll warn you that Breath of Fire 2 is pretty hard. That game made me wish I had a Game Genie.
If you can find Final Fantasy 6, that's a great addition.
Terranigma's difficulty curve is kinda wonky. Ranges from being laughably easy to near-impossible, as I can recall (I remember the last boss being especially irritating).
The way defense works in Terranigma is weird. The first time I got to the last boss, I did 1 damage to him and 2 on a critical strike.
I grinded some levels for an hour or two and then I was magically doing like 50 every hit.
The game makes it pretty clear when you are under-leveled in that sense (and the opposite is also true; if you are over-leveled, you will bulldozer everything).
EDIT: do people even know what a Game Genie is nowadays? If not, it was the SNES cheating device. It was a cartridge in which you could put your cartridge and change hex.