The NWA World Heavyweight Championship was defended Defending in a Raven 's Rules match Competition between then-champion Raven and the challenger Rhino .

Extreme Rules ( 2012 ) was a professional wrestling Hostile_encounter pay-per-view ( PPV ) event Social_event produced Creating by WWE .

It was the fourth event under the Extreme Rules chronology .

The concept of Extreme Rules was that the event comprised Cause_to_be_included various hardcore-based matches Competition .

In the main event , John Cena defeated Conquering Brock Lesnar in an Extreme Rules match .

The event received Receiving 263,000 buys Commerce_buy , up 25.8 % from the 209,000 buys Commerce_buy for the previous year 's event , whereas the next Extreme Rules event in 2013 received Receiving 231,000 buys Commerce_buy , a drop Motion_directional of 12.1 % .