The Steam game The Binding of Isaac has sold more than 700,000 copies since it released on September 28, 2011. Wrath of the Lamb DLC was released on Steam on May 28, 2012. It has in just three weeks sold to 20 percent of the people who bought The Binding of Isaac.
"Who would have thought a game about an abused child fighting off his mother with his tears could ever sell 700k copies in less than a year?" said game designer Edmund McMillen. "Not me, that's for f*cking sure. 700k is a big number... maybe its time to bring this thing to console ;)"
The DLC had a rocky launch so McMillen decided to update it with more "items, bosses, enemies, music, secrets and a very hard to attain final ending cut scene that should shed some light on the games story even more."