I knew about being able to use Tent in a battle. I mostly use it on some bosses at the beginning of the battle rather than my own characters, though. It works wonders on Meltigemini since it can't do much damage to you when it's hit by several status ailments. Other things I discovered very late in the FFs:

- Eiko can also jump in the Jump Rope minigame.
- Chocobo Hot & Cold is a really fun minigame.
- You can use Dark Matter to deal 9999 damage to anything.
- You can "defeat" Beatrix without hitting her once, you only need to survive for a few turns.