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