Persona 2: Eternal Punishment

Note: This game is also titled Persona 2: Batsu.

Teleport (Japanese version):
Use the map, choose a location, then press Select to teleport there immediately regardless of the different stories. Note: This does not work in some areas, such as locations where your party is all able to talk to, and no enemies. The map will show that area as Green when you are in that room.
Information in this section was contributed by GameShen.

Full map access (Japanese version):
Press Start(2) when using the map to get the full map. This also works with the "Teleport" trick and includes different stories/levels.
Information in this section was contributed by GameShen.

Increase Persona rank (Japanese version):
During battle, go to "Strategy" on the menu and select "Action". Choose any character whose persona you want to rank up. Then, go to "Status". While you are at the status menu of the character, hold R1 to instantly rank up your Persona to 8. Press L1 to decrease the rank. You can now access all the spells the Persona would obtain at rank 8, but you cannot get hidden spells gained by mutation.. If you want to rank up several Personas at one time, just change the Persona using "P.Change" and repeat the whole process.
Information in this section was contributed by Hong Zhi-Yang.

Unlimited money (pre-release version):
Go to Mu Continent and play with the slot machines. Enable the "Debug mode" code and enter the reel edit option. You will see something similar to:

     0 0 0
     0 0 0
     0 0 0
    Off

Select the "Off" and it will turn to "On". When you play the slot machine, it will give you 500,000 coins. Note: You will need to repeat the trick each time you play the slot machine.
Information in this section was contributed by Ignacio Romano.

Debug menu (pre-release version):
Hold Select + Start + L1 + R1 during game play to display a debug menu. Press L1 + R1 + L2 + R2 + Start + Select at the debug menu to advance to the next mission. This may also be done during Boss fights.
Information in this section was contributed by eroid.

Alternate spells (pre-release version):
While in a battle and choosing a Persona spell, highlight any spell and press R1 or L1 to scroll through the spell list. This will even allow you to cast spells you have not learned yet. Note: This also includes spells only found in enemies and special characters -- choosing these spells may cause the game to freeze.
Information in this section was contributed by Jorge Ang.