Unlockables
Play as Drizzt

Get ThisBy Doing This
Drizzt Do'UrdenWin the game once on any difficulty.

How to Unlock Artemis Enteri
Get ThisBy Doing This
Artemis EnteriWin the game on extreme mode

Easy Duplication
Simply Save your character, and import on a new one, or possible the same
one, drop the stuff and re-import.

Simple as that, but to do this you need 2 characters playing, but if your
not simply save your single-player character, play multiplayer, follow the
steps above and save it, and there we go! Duplicated items!

Easter Eggs
Loading Screen Trick
While the game is loading and you see the text Loading, use the R3 analog
stick to move the flames left, right or up.

Make Lyran disappear!
Under Act 2 of the game, when you get to Lyran's Hold and find your way
into his Private Study, Lyran will appear (as a Lich) and will follow and
attack you. Normally, you'd want to avoid him and get down to the cellar
ASAP. However, you don't need to!
Just run out of his study with him following, then Recall back to Baldur's
Gate. When you Recall back again, he ain't there anymore! Now, you can
toddle down to the cellar at your own pace.
This was discovered on the European (PAL) version.

Glitches
Start an extreme game with previous items
This will start an extreme mode game with the items on a non-extreme save.
First start a new extreme game and load the character you want. Then go to
change players and start up a new player 2 character. After the 2nd player
loads, remove player 1. Once that's done import the character that you
just removed into the player 2 slot (A message about importing characters
will pop up, just continue). When its done loading you should have the
character loaded with all his/her items from that save.
Next just remove the player 1 charater and you're done.

Codes
Level Up/Money Cheat.

Get ThisBy Doing This
Level 10, 45 skill points, 500,000.Press and hold L1 + R1 + Triangle
+ Square + Circle + X. While still holding them, press L2.

Extreme Mode
Get ThisBy Doing This
Extreme ModeWin the game on any difficulty to unlock Extreme Mode

Level Warp and Infinite Health Menu
During play press and hold L1+R1+Triangle+Square+Circle+x then, while
still holding these buttons, press START. A menu should appear.
Get ThisBy Doing This
Take no damage, but if you fall into a pit, you will be
stuck.Infinite Health
select any area in the game, press Circle to exit menu after
warp.Level Warp

No Lyran until you enter his cellar.
For some time now, I have been reading different cheats on how to get rid of that pesky Lyran once you exit his study. Run out use a recall and then come back in again. Forget about that because there is a better way. And I tell you how!

Once you're on the second floor and you have found the secret opening to Lyran's study read the scrolls but "do not" open the front door. Instead, exit the same way you came in. It works all the time.