2 Player mode resurrection:

When in 2 player mode one of you will eventually die, so just run to the nearest save. See the ring of light around it? walk into the light! It automatically brings your dead player back to life, It's ALIVE!!!
Sent in by: prototypefreak=Mark3

Cheat Mode - Hold R2 + L1 + Left + Triangle then press Start during game play. A cheat menu with "Invincibility", "Level Warp" options will be unlocked. 

Duplicate items - Save the game, then drop the items to be duplicated from the inventory of your current character. Press Start and choose change your character. Import your character from the previously saved game. The game will bring in your character with all items in inventory at the time of your save, and allow you to collect the duplicates that are on the ground. 

Resurrection in multi-player mode - If a player dies during multi-player mode, have the surviving player go the previous save point. Then, press Square (Use) repeatedly with the deceased player's controller. The character will be resurrected with all items, but at half hit points. 

More money - Go thru the game a good distance... Then when you have some good items, start a new game and character. Import old character strip him/her of all items, then pick em up with new character. It makes beginning of game a lot easier, and you can do it over and over!

Extreme mode - Successfully complete The Gauntlet level to unlock the extreme difficulty setting.

Play as Drizzt - Successfully complete the game under the extreme difficulty setting. 

Super character - Hold R2 + L1 + Left + R3 then press Start during game play. Your character will now be at level 20 and have access to all feats. Your character will also have level 1 feats on all class dependent feats and 75,000 more gold pieces. 

The Gauntlet level - Successfully complete the game under any difficulty setting.

Make extra items! This is kind of an in-game thing, and it can get pretty tricky, since the game will not allow two players to have the same race. Anyway, if you find, say, a Ring of Protection +3 (or something similar), and you want to make another one to sell or to wear, here's what to do. 1. Save the game with the character that has the item you want to duplicate (say it's the elf) 2. Start a new game with a character of a different race than the character who possesses the item you wish to duplicate (make a new human character, for example) 3. Import the character with the item as a second character in the new game (bring the elf into play with the human) 4. Give the items to the new character (give the items from the elf to the human) 5. Save the new game on a NEW FILE! Do not overwrite the game where you have your one character! (Don't overwrite the 1 player game with just the elf) 6. RESET the PS2. Do not attempt to load the other game...it will overwrite your characters if you do. 7. Load your one player game, and then import the "new" character who just received all of the items (Load the game with just the elf, and import the human character you had just made, who is carrying all of the extra items). 8. Give the "old" character all of the items again (Give the original elf all of the items that she had given to the human before. She should now have two of those items). 9. Save the game over the previous two player save you had made. 10. RESET the PS2 again. Load the one player game again (Load the original elf yet again). 11. Upload the same character from the two-player game as your new player in the one-player game. That character will have all of the duplicated items (upload the elf from the two-player game as the first player in the old game. It will overwrite the old elf character with the new one that has the duplicate items). You can use this trick to bring high power weapons and armor from the end of the game to the start of the game. You can have a first-level arcane archer with a bow from Hades, or the Onyx Sword. The possibilities are endless.  -Gandalf

Unlock Drizzt Do'Urden: Hold R2 + R1 + L1 + L2 while selecting your character. However, you cannot load a saved game using Drizzt until you've unlocked Extreme Mode.

Level 20 Character and 75000 Gold: When in play mode, press L1, R2, Triangle, Left D-Pad, R3 and start at same time to instantly make your character 20th level, with 75000 gold, 1000 Health and 1000 Mana, and a minimum of 1 in every feat, including other character specific feats. The downside is that your character does NOT gain any further experience points while playing, and is stuck at 20th level, with low level feats. The normal character max is 40th level.

To get Drizzt - First, start a new game. Then when selecting a character hold L1 L2 R1 and R2, then pick a character. If you did this right, you should be Drizzt, but not the guy you selected at first. If it doesn't work, try selecting the first guy (I only tryed with him).

Unlock Gauntlet Mode: To unlock Gauntlet mode, complete the game once on any difficulty.

Unlock Extreme Mode: To unlock Extreme Mode, simply beat Gauntlet Mode.

Quick Level Up: At the beginning of the game press down and hold R2 L1 Left d-pad triangle and Start to access the cheat menu. Then turn Invincibility on and use Level Warp to transport yourself to "the gauntlet" level. Advance as much as you possibly can without running out of time. This level has pretty good monsters to hack and slash and gain lots of experience and gold. But remember, before you run out of time Level Warp yourself again into the Tavern. Keep transporting between the Tavern and the gauntlet until you reach whatever level you want. Once you gain enough levels you could probably make it all the way to the end where an Iron Golem is waiting for you. If you kill it not only you receive tons of exp's but also you can pick up the Onix Sword for some massive damage and if you are running short of gold you can sell this sword for over 98,000 gold pieces.

Play as Drizzt: To unlock Drizzt this is what you need to do: 1- Finish the game.

2- After the credits you will play an additional level ( the gauntlet ) as Drizzt. DO NOT SAVE during this level.
3- Once you finish the gauntlet level you will unlock the "extreme" difficulty level.
4- Beat the game again in "extreme" difficulty.
5- Import Drizzt into a new game.

Auto Level up: Press R2 L1 Left d-pad R3. This cheat automatically takes you to level 20, gives you access to all the feats (depending on the current number of slots available). It also gives you level one feats on all of your character's class-dependant feats and an additional 75,000 gold pieces.

Invincibility: Press R2 L1 Left d-pad triangle start. This cheat unlocks the invincibility option and the location wrap.

Fast Level Up And Cash - First activate the invincibility cheat, then level warp to the bthrone level and kill the boss there. This gives 2000 exp per kill. then level warp to Towerh level and go down the stairs to tower4. You will appear next to an iron giant, kill it and get 7000 exp plus an onyx sword. Then level warp back to bthrone and kill the beholder again. Keep repeating until you get the required level. Also, you can sell the onyx sword for 98000 gold.

To get Drizzt - First, start a new game. Then when selecting a character hold L1 L2 R1 and R2, then pick a character. If you did this right, you should be Drizzt, but not the guy you selected at first. If it doesn't work, try selecting the first guy (I only tryed with him).

Quick Level Up: At the beginning of the game press down and hold R2 L1 Left d-pad triangle and Start to access the cheat menu. Then turn Invincibility on and use Level Warp to transport yourself to "the gauntlet" level. Advance as much as you possibly can without running out of time. This level has pretty good monsters to hack and slash and gain lots of experience and gold. But remember, before you run out of time Level Warp yourself again into the Tavern. Keep transporting between the Tavern and the gauntlet until you reach whatever level you want. Once you gain enough levels you could probably make it all the way to the end where an Iron Golem is waiting for you. If you kill it not only you receive tons of exp's but also you can pick up the Onix Sword for some massive damage and if you are running short of gold you can sell this sword for over 98,000 gold pieces.

Auto Level up: Press R2 L1 Left d-pad R3. This cheat automatically takes you to level 20, gives you access to all the feats (depending on the current number of slots available). It also gives you level one feats on all of your character's class-dependant feats and an additional 75,000 gold pieces.

Invincibility: Press R2 L1 Left d-pad triangle start. This cheat unlocks the invincibility option and the location wrap.

Game Shark Codes:

(M)Must Be On 0E3C7DF21645EBB3 0C175D4BF89C1FB7 
Infinite Health 3C20A8D346C4FEFE 
Max Health 3C20A8D746C4FEFE 
Infinite Magic 3C20A8EB46C4FEFE 
Max Magic 3C20A8EF46C4FEFE 
Max/Infinite Money 3C20A80BF814487E 
Carry No Weight 2C20A855F8FCFEFE 
Infinite Spell Upgrade Points 1C20A80FF8FCFE53 
Play as Lotor 2C20A77BF8FCFEF3 2C20A77FF8FCFEF3