Valkyrie Profile

• Play the game on Hard Difficulty. It's actually not harder, it simply has more dungeons and other content available. And after finding a "Jewel Orb" in each of those dungeons, you gain access to a final, extra secret dungeon, the Seraphic Gate. This is not possible if you play on Easy or Normal.

• Look up how to get the A ending. It's very easy to miss, and it's 1000x better than the B and C Endings.

• Alternately, I'd do two playthroughs. One on Normal/Hard to familiarize yourself with mechanics - where you take the game easy and don't worry too much about optimization, just enjoying the story and getting the B ending - and one on Hard where you follow a guide for the A ending. The B ending sets up the A ending in an interesting way, and the things you have to do to acquire the A ending are so precise that you'll be following a guide every second if you do it on your first playthrough.