If you have a GBA/DS/DSlite/3DS, I would definitely suggest Fire Emblem. It is a great game that is also quite challenging at times. If you don't have a gameboy of some type, there is one for the GameCube (If you have one of those still) called Fire Emblem: Path of Radiance, it has to be my all time favorite Fire Emblem game to date. Aside from that, for the Wii is Fire Emblem: Radiant Dawn. It's a lot like PoR in gameplay aspects, but there are quite a few things they changed there. Radiant Dawn is actually one of the harder Fire Emblems to play, they put you up against a lot more enemies with a lot less on your side.
Those are just my suggestions though, I hope you find what you are looking for!
