Use the following trick to get to level 20. Create a new character. Use the "Create item" code and create BOOK03 through BOOK08 to increase your character's Constitution, Strength, Dexterity, Intelligence, Charisma, and Wisdom to 25 each. Then, use the experience cheat to get your character to their highest level. Before you go on make sure you can use Dual-Class, but do not use it yet. If you cannot, try killing some people to lose reputation and lose your class (become fallen). Dual-Class may work now. If it does, export your character. Uninstall the game and just install Baldur's Gate. Now when that is done, just start a new game, import your character, and use Dual-Class . If it worked the game will say you gained a level. When you click "Level up" it will bring your new class up to 20 levels. Note: This takes some time to do. To make the first part faster, use the "Create item" code, make MAGE06 and equip the item.