Slime Time mini-game:
Insert the "Making Of" disc. Press Circle(2), X, Square(2), Triangle, Circle, X, Square, Start at the main menu. The words "Arc The Lad Slime Time!" will appear to confirm correct code entry. The mini-game is a one or two player game of checkers, using Slimes from the game.

Debug mode:
Insert the "Making Of" disc. Push Circle, Square, Circle(7), Square. The debug menu will appear. You will be able to select any this will take you to a menu where you can look at the contents of any PlayStation disc. Highlight an option and press X to view that file. To view the contents of another disc, swap discs and press Start.

Hidden message:
Insert the "Making Of" disc. Wait for 1 minute 28 seconds on Chapter 5, then select "Pause".

Arc The Lad: Unlimited Cure-Alls:
After your first visit to Toyoke forest, keep going back and talking to the Forest Spirit. She will keep giving you a Cure-All each time you talk to her.

Arc The Lad: Characters and Spells:

Arc
Burn Ground (volcanic eruption on enemies)
Total Healing (replenishes HPs)
Gail Flash (mystic forces flashes on enemies)
Slow Enemy (decreases dexterity of enemies)
Meteor Fall (huge meteor clashes on enemies)

Kukuru
Cure (replenishes HPs)
Depoison (cures poison status)
Silent (disables enemy's magic use)
Refresh (cures status)
Ten No Sabaki (hail of explosions)
Resurrection (revives dead party members)
Divide (steals HPs from enemies)

Poco
Ikusa No Kodaiko (raises attack levels on party members)
Arajishi Daiko (laser attack on enemies)
Hero Hero Rappa (huge stone notes drop on enemies)
Ieyashi No Tategoto (replenishes party member's HP)
Noroma No Bass (decreases enemy's dexterity)
Idaten No Okarina (raises party member's dexterity)

Tosh
Oukarai Bakuzan (three deadly slashes to enemy)
Juubakuken (paralyzes enemy)
Shinkuuzan (Illusion attack for enemy at two squares away from Tosh)
Koenzan (Shadow attack to inflict deadly)

Gogen
Explosion (massive explosion against enemies)
Dream Knock (casts "sleep" on enemies)
Diamond Dust (hails of ice thrashes on enemies)
Wind Slasher (cyclones thrash against enemies)
Heat Wall (creates a fire barrier against enemies; see Hints)
Thunder Storm (summons lightning bolts)
Teleport (teleports)

Iga
Shingan Hoo (casts "rock" on enemies"; see Hints)
Taimakoodan (releases lasers against enemies)
Senbuugekishuu (releases a flaming kick to hit all enemies around him)
Ryuusenbaku (summons winds to lift enemies and thrashes them on ground)
Kishin Ryuueiha (throws ground lightning bolt)
Metsushuu Reppa (energy wave attack)

Chongara
Keraku (three elves who heal members)
Monfree (creates tiles for passage)
Fuugin (wind demon; see Hints)
Raigin (thunder demon; see Hints)
Hemogee (transforms enemies into trolls)
Odon (morphs into enemy)

Arc The Lad 2: Easy money:
You have to have Lieza must be in your party. Have Lieza catch a monster, then go to the monsters stats and unequip all his armor and items. Sell all those items, then insert the Arc Arena disc and sell the monster. You will probably get about 2,000 for everything.