How do you get invincibility in LEGO Batman

Invincibility is available as an extra. You can purchase it for 500,000 points after you unlock it. You can unlock it by finding the corresponding red brick during free play. It is located within the mission titled Dying of Laughter. It is the final villain level: the fifth chapter in the Joker sequence. It is set at Gotham Cathedral. Climb a spiral staircase stage right, and then destroy the chandelier with a bat-a-rang. Use pieces from the broken chandelier to build a floor sweeper. Clean up all the peanut butter and jelly paint on the floor and the brick will appear.


Alternately, you can just enter the following cheat code:
Invincibility WYD5CP