These are some of the secrets / game bugs in FF1. Some of them are quite useful, like the super-strong monsters above Pravoka, but most are just curiosities or things to do for fun.

Minigame

While aboard the Ship, press A and B at the same about 55 times in a row. The screen will flicker, then go black, and BAM! a little sliding number puzzle appears. Get all the numbers in the right order to win. This game is hours of fun. (not really, it's incredibly boring and pointless, but play it once anyways). You also get a whopping 100G for winning the mini-game.

Invisible Lady

Lurking in the very depths of Castle Coneria (actually he's on the first floor) is a man (woman?) to whom you can speak, and hear, but CANNOT SEE! He's (she's?) invisible. Who is he/she? Where did he/she come from? Why can't you see him/her?

After long hours searching on the internet, and hearing countless rumors, I've finally found out who the Invisible Man/Woman is. For a detailed explanation, go HERE.

Peninsula-with-the-extra-strong-monsters

Actually, they aren't invading, but there are some very out-of-place monsters to the north of Pravoka. This was apparently a programming error; the random monsters from the northern continent were accidentally placed on the very top of the southern continent. Although, the fact that this same "bug" appears in the WSC version of FF1 leads me to believe that it was either purposefully included in the NES FF1, or it was a bug in the NES version but included in the WSC version because it was popular or because Square didn't want to admit they made a mistake. Who knows. Not I. This is a very good place to gain levels early in the game, if you can survive long enough. The monsters found here are FAR above the level that you'd normally fight at this point in time; just walk back and forth on the four squares of land at the very end of this peninsula to get rich quick.

Land on the Caravan

You can usually only land the Airship on grasslands. But there is ONE square of desert on which the Airship can land. Where? Right on top of the Caravan. It'll save you a long walk to the Caravan, at least.

Tomb of Erdrick (or Link)

In Elfland, just beside the White Mage shop, there are three tombstones. Two of them are just ordinary tombstones, but the one on the left is special. It is the tomb of Erdrick. Who the heck is Erdrick? Erdrick is a character from Dragon Warrior, another very popular game series produced by Enix (although Dragon Warrior pales in comparison with Final Fantasy). In the Japanese version of FF1, tomb says "Here lies Link" instead. Link, of course, is the hero of the Zelda series.