To enter these codes, simply enter it as your name when playing.
Code - Effect
imalwaysright - Any answer correct
halfeverything - Infinite Usage of 50/50(once per question)
waytooeasy - Infinite Usage of All Lifelines(the Lifelines can be used once per question)
crowdcontrol - Infinite Usage of Ask-The-Audience(once per question)
callingcard - Infinite Usage of Phone-A-Friend(once per question)
(nothing - don't enter a name) - No Lifelines
Regis Easter Egg
When typing your name in, enter "Regis" in and he'll change it to something else and comment about it.