Any chance of altering xp gained in phantasy star? I don't know how the monster's loot and xp are set up but if it's like a table, maybe making one of the low level monster (the one usually found early on?) to have 256 xp instead? Kill a few, boom max level.
I tried for an Exp code with no real success, I can get the number displayed after the enemy death to be much higher; but that don't actually give you the exp.
Then I was able to get max exp points to be given after battle, but the stats didn't increase.
What is the end result you're looking for?
I could make some codes that alter your stats after leveling up, or infinite HP.
These are the Game Genie codes I quickly made without much testing:
Phantasy Star (USA, Europe) (Rev 3)
More Defense On Level Up (Alis)
738-25E-3B7
At beginning of the game, after first level up the Defense was 58 instead of 13.
Infinite HP In Battle (Alis)
7E5-C9E-3B7