Play Dante's mission 1, then save the game. Reset the PlayStation 2 and wait for the "Press Start button" message to re-appear. Press L3, R3, L1, R1, L2, R2, L3, R3. If you entered the code correctly, you will hear a sound. Press Start to return to the main menu. Choose the "Load game" option, press L1 or R1 to access the new costume, then load a game to play the bonus level.
Play Lucia's mission 1, then save the game. Reset the PlayStation 2 and wait for the "Press Start button" message to re-appear. Press L3, R3, L1, R1, L2, R2, L3, R3. If you entered the code correctly, you will hear a sound. Press Start to return to the main menu. Choose the "Load game" option, press L1 or R1 to access the new costume, then load a game to play the bonus level.
While playing the game, press R1(2), Triangle, Square, R2(2).
While playing the game, press L1(2), Triangle, Square, L2(2).
Use the following trick to unlock the completion bonuses by only playing Dante's game. Switch from Disc 1 to 2 at any time during Dante's game. Successfully complete the game to unlock level select mode, hard mode, Bloody Palace mode, and the credits. This trick also works for hard mode. If you change from Disc 1 to Disc 2 anytime before you complete the game in hard mode, you will unlock Trish and other bonuses.
Successfully complete the game with either character on any difficulty setting to unlock the level selection option.
Successfully complete the game with Dante and Lucia to unlock the hard difficulty setting.
Successfully complete the game with Dante on the normal difficulty setting to unlock an alternate costume. Successfully complete the game with Dante in Dante Must Die mode to unlock his original costume and Force Edge sword from Devil May Cry. The combat music for all of Dante's missions will also be changed to the combat music from Devil May Cry.
Successfully complete the game with Lucia to unlock an alternate costume for her. Successfully complete the game with Lucia on the hard difficulty setting to unlock another costume for her.
Successfully complete the game with Dante on the hard difficulty setting to unlock Trish. Trish has Dante's stats and items and starts with the Sparda.
Successfully complete the game with Lucia in Lucia Must Die mode to unlock Lucia's bodyguard, Arius.
Successfully complete the game with Dante and Lucia to unlock Bloody Palace mode.
Successfully complete the game with Dante on the hard difficulty setting to unlock Dante Must Die mode.
Successfully complete the game with Lucia on the hard difficulty setting to unlock Lucia Must Die mode.
While playing the game, press Start + Select to return to the title screen.
Enter the big doors to the right of the pillar where the Puia (flying harpies) first appear in Mission 1. Go through the level until you see a wall with a face. Press Circle and you should enter a secret room.
After completing either character's game at least once and have unlocked the "Mission Select" option, go to mission 1 and collect the Yellow Orbs. Save the game and quit. You may now continue where you left off. This trick is useful when facing the tougher Bosses on the harder settings.
Go to the part at the beginning where you double jump over the rubble blocking the way ahead. Face the statue and double jump to the statue's shoulder, then again to his head. Once on his head, at many Red Orbs will fall.
Enter one of the rooms that has a coffin and bones in it. Go up to the coffin and press Circle. This will take you to a hidden room full of enemies and some Red Orbs. There are actually two secret areas in mission 2. Both are in separate rooms where skeleton coffins are located. Check every coffin you see to find them.
Before or after the cargo elevator trip, you will reach a door located between two other doors with just a couple of stair steps. Stand in front of the door on the left side of the screen and press Circle to enter a secret room.
When you start, look for the first door on your left. It is not very big and is sticking out slightly. Approach it and press Circle. It will lead to a secret area where big flying creatures attack you.
At the very end of the mission, before entering the door that leads to the roof, press Circle at the door to the left.
After defeating the giant butterfly and the larvae, you will go down a set of stairs. After the game loads, go to the first set of doors you see and press Circle to enter another hidden room.
On this mission, you will enter a room where you will find the item named Sacrilege. Get the item to make the energy balls stop coming at you. Then, on the floor directly under the balcony where the item was located, there will be a wall that resembles a door. Press Circle in front of that wall and it will open a secret room.
As Dante, start from the first head and work your way to the left. Then, position Dante in between each head and target it with the Missile Launcher then take it out from afar. Tis will also work on the Griffon, but his electric attacks will eventually make their way towards you. The only way to avoid them is to Flip Escape to the right and get out of their range.
To do the Ultimate Devil Trigger into Sparda demon form, press L1 when Dante's life bar is low. The Sparda form is incredibly strong and deals huge damage.
When in Lucia's Devil Trigger, equip the Aerial Heart and fly in the air after they are near you. Press Triangle + Square constantly until you do not have control of Lucia. She will perform an attack similar to the Phantom's Volcano Ass attack. It will take a lot of Devil Trigger. If you keep pressing it fast it will not waste Devil Trigger at all, but it will eventually stop.
If you get hit and thrown to the ground, press Circle as soon as you hit the ground and you will immediately bounce back up.
Stand just near the edge of a building and shoot your gun. While shooting, go to move off the edge. The moment that you are off the edge, you will immediately fire another shot from your shotgun.
Trish has two moves that Dante does not. One is throwing Sparta, which is done by holding Triangle briefly and releasing. Trish will throw Sparta. You can shoot at the same targets that Sparta is attacking and do twice the damage. For the other move, fly using the Aerialheart and hold Square. Trish should fire beams of yellow light which do an amazing amount of damage. The longer you hold Square, the more beams she will shoot at once (five beams maximum).
Use sword combos as much as possible. If an enemy is too far away for you to instantaneously attack them, use your arsenal/guns until you get close enough to use your sword(s) on them to keep the combo rating lit.
Whenever something grabs you (for example, those invisible grasshoppers on top of you or the giant gorilla Boss), turn on your Devil Trigger very quickly and you will easily break free.
Play Bloody Palace mode and defeat all the monsters. Choose the green portal to go 100 levels every time. 100 levels equals 1000 Red Orbs.
Successfully complete Dante Must Die to unlock Dante's original costume from Devil May Cry. Rebellion will be replaced with Forced Edge. Note: It does not change to Sparda if you are in Devil Trigger form.
There is a Slow Motion Amulet piece in the level after the Phantom (the level arena with eye in the center). Toward the outside is a sack or web cocoon on the ground. Break it open. Apply the Amulet and use Devil Trigger to see all your sword combos in slow motion.
Explore the level before you attempt killing a demon or devil. When you defeat them, the game will cut to an intermission sequence and you may leave behind important items. For example, in the mission where you take out the three tainted tanks, from start turn to your left and jump into the rubble to find a Heart Of A Warrior amulet piece.
These combos are based off of the basic attack mode without holding R1. These will help you get a better combo rating, especially if you do the first and follow with the second. Make sure not to hold R1 button or you will do the Air Hike or the Stinger.
Three basic slashes plus a downward strike, then an upward strike that knocks your enemy into the air like the Air Hike: Press Triangle(3), Towards + Triangle, Triangle(2).
Three basic slashes then three additional horizontal strikes. Press Triangle(3), Away + Triangle, Triangle(3).
Equip any sword and the shotgun. Holding R1 and do the following:
Dante will do a normal slash, then a cartwheel move while firing the shotgun. Press Triangle, Square.
Dante will do two slashes and pass the shotgun under his two arms and across his back, firing the shotgun twice. Press Triangle(2), Square.
Dante will do three slashes and then go into one knee firing the shotgun. Press Triangle(3), Square.