Completion bonuses  -  Successfully complete and save the game, then reload the cleared game file. The "Game Record", "Sound Test", and "Mania" options will now be unlocked at the title screen. Also, go to the Grade Shop to access new items.

Fight against Aviation  -  Get all nine Darkness Weapons and go to the Darkness Temple to fight Aviation.

Mania Difficulty  -  To unlock the 'Mania' difficulty, simply beat the game once.

Game Record  -  To unlock 'Game Record' at the title, simply beat the game once.

Grade Shop  -  After clearing the game once, load the clear data, then you will be able to buy stuff such as Max HP Increase, Exp*10, Exp*2 with Grade.

Lloyds Ultimate Sword  -  The Material Blade is not Lloyds best weapon. The best weapon for Lloyd is the Kusanagi Blade. How you get it takes some doing. You must beat the Sword Dancer 3 times. First he appears in the mine at the Ossa Trail with 8,888 HP. He disappears after Lloyd speaks to Colette at the mountaintop of Hima right before going to the Tower of Salvation. Second time is in the Gaoracchia Forest. He has 33,333 HP. He disappears after you defeat Luna and Aska. The third time is in Iselia Forest after the party returns from the Tower of Salvation and Colett's illness is cured. The creature has 99,999 HP, so it has more HP than any other creature in the game. The last time it is defeated, it drops the Kusangagi Blade. It takes some effort, but it’s worth it.

Unlock Modes  -  Complete and save the game to unlock the game record, sound test, and mania options.

Unlock Aviation  -  To fight Aviation, collect the nine Darkness Weapons and go to the Darkness Temple.

View All Skits  -  Beat the game, then talk to the mayor of Katz' Village.

Alternate Costumes  -  You probably should do this anytime you pass by cities but it may not happen at that point so return later after another major event.

Colette-fair lady costume - Complete Princess Guard Sidequest
Colette-Maid Costume - Talk to the two girls in Meltokio castle
Colette-Mermaid Costume - Complete Altamira Child Find Sidequest
Genis- Easter sunday - Complete princess Guard Sidequest
Genis-Beach Boy Costume - Complete Altamira Child Find Sidequest
Genis-Katz katz katz costume - Complete katz katz Katz Sidequest
Kratos-Judgement - If u chose Kratos over Zelos at Flanior then when you get to the part where Lloyd gets the Material Blade Kratos will join your party and have it
Lloyd-Beach Boy Costume - Complete Altamira Child Find Sidequest
Lloyd-Nobleman costume - Complete Princess Guard sidequest
Lloyd-Pirate Costume - Agree to Aifread's Sidequest
Presea-Klonoa costume - talk to George in Altamira
Presea-Little madam Costume - Complete Princess Guard sidequest
Raine-maiden Costume - Walk up to the Wind dais in Asgard
Sheena-Successor Costume - Talk to Sheena's grandfather in Volt's Temple
Sheena-You look great Costume - Complete princess Guard sidequest
Shhena-Queen of the Beach Costume- Complete Altamira child Find Sidequest
Zelos-Masked costume - simply walk to zelos' house

Naming Dogs  -  Walk around a town as Collette. If you see a dog, go talk to it. Collette will name the dog. This trick only works as Collette.

See Corrine in his true form  -  After Corrine has already died and you have defeated the Dark Dragon and walked through the doors in Mitho's Castle, go all the way back to Iselia. Once there you should see a skit involving Sheena hearing Corrine talking to her. After that go to the Temple Of Martel. Once there go to the place where you first met the angel. When you enter the area you should see a secret scene with Corrine in his true form.

Easy Money  -  In the Earth Temple, after you fall through the boards down to the bottom, get in a fight with the dragon flying around down there, he will usually give you at least 1 GRADE and will always give you 10000 Gald. All you have to do is leave through the door and go back in and keep fighting him. Also good for experience.