Eternal Ring PS2 cheats

The Secret Dungeon:
There is in the game a hidden dungeon divided into four Floors. To access this area, you have to possess a Dark or Light Magic Spell Ring. Then go to the beach where you start the game, go to the left and you'll find a door that is locked. Cast a Dark or Light Spell on the door, and it will open. Inside this dungeon, you'll find really tough monsters. Most of them will be able to kill you in one hit, so be very careful. Here are the reasons why you must visit this dungeon:

You'll get Lvl 5 Magical Stones of all kind.
You'll find Magic Rings (in the 3rd floor, there is a bird that give them infinitely).
You'll find Special Rings (including the Mirage Edge, that makes you hit 4 times instead of one).
You'll find the Eternal Sword (you have to kill a monster in the last floor to get it).
You'll gain tons of XP (big birds in 2nd floor are the best). - You'll be able to become almost invulnerable (see below).
To become invulnerable (any attack will have almost no effect on you), here is the trick. On the 4th floor, their are white crabs. Almost each time you kill them, they'll drop a Dragon Fang that will raise your stats (resist fire, resist ice...) by one. All you have to do is to kill all these crabs (using the Mirage Edge and the Eternal Sword is the easiest way). Then use all the Dragon's Fang, go to the 3rd floor and back to the 4th, and all the crabs are back... Keep doing that until all your stats reach 255, and you won't fear any monster.
A few hints: First, don't try to kill all the baddies, espacially if it's the first time you enter the dungeon. Just run and try to find the teleporter to the next floor. Once you'll reach the 4th floor, you'll be safe because there are very few monsters there. You'll be able to kill them one by one. Start by killing the big monsters to get the Mirage Edge, then kill some crabs to make your caracter better. Then just go out and save your game. After that, go back to the 4th floor and try to get the Eternal Sword. Once you get it, go out and save again. Finally, go back to the 4th floor and kill crabs again to max out your stats. After reaching 255 in each stats, you won't die whatever happens, so just go to the 3rd floor and kill the big birds that are there. This will max out your XPs. After that, you can visit all the floors and make you collection of Magical Stones and Rings.