Final Fantasy I & II Advance

To do extra damage, take any damage doing spell(such as Fire, Ice or Holy)
Now go into a fight with only one monster and when your aiming your spell hit up to target every monster (even though there's just one) and attack. you do 1.5 more damage then if you attacked with it aimed only for the solo monster, because the way this damage is done is (Spell damage)x 1.5/ by the number of monsters

You still get the 1.5 boast to the spell, but it is divided by 1, thus not lowering its damage compared to if there were 2 monsters.

While on the ship, hold down A and keep tapping B. Soon, a sliding tile minigame will appear. The aim of the game is to put the numbered tiles in order from 1 to 15. If you do well, you gain items and money!

Simply attack yourself one or two times, and your HP and/or stamina will be raised after almost every battle. Im REALLY early in the game and i already have over 1000 HP for each character, and it barely took me any time. As an added bonus, your weapon levels will also be raised.

In the Water shrine, go in it and find the area with all the dancers. Talk to alot of them and you should hear some say something about the Tatarus theater and the "I want to be your canary" play which is all Zidanes theater group in FF9!

In Final Fantasy I when you visit Elfheim, press A on the left most tombstone behind the inn. It will say "Here lies Link." Link being the famous star of the Legend of Zelda series.

In the jade passage in Final Fantasy II, there is a Magic seller behind the lowest level of the waterfall. Enter the waterfall by hugging the wall from the right of left, then when you stop, press the talk button.

Beat the game once and wait until it tells you to save after the credits.

Okay, once you get the toad spell to level 16, get on the snowship, then hold A and press the B button 22 times. The secret minigame will then pop up. Play the first one, but don't worry about winning. After you uncover all the toad squares, write the pattern down. Some look a lot alike, so be careful. After that, start a game and give up 31 times without playing. On the 32nd time, it will be the same exact pattern as the one you wrote down. You can now get the best sword and armor in the game.

This 2x2 piece of land is Northeast of the town of Pravoka. From Pravoka, head South to the mountains, then East until you see a dock, then from there, head North. The monsters you can find is a whole lot stronger then ordinary monsters around. Other then leveling up skills quickly, the equipments the monsters drop is the best you can get for quite a while; Winter Wolf drops the Ice Shield! Minotaur Zombie drops the Great Axe!

In Final Fantasy 2 go down from the first town to a peninsula and move around till a foe come out. There you fight very hard foes like Brains. You get major stat boosts if you survive. Great if you started a new file.