"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?" The Binding of Isaac developer Edmund McMillen wrote in an email blast last night. "Not me, that's for f*cking sure."

Thanks to Isaac's Wrath of the Lamb DLC, released in late May, the game passed its latest sales milestone, with the expansion selling a fifth of the overall sales in less than three weeks, according to McMillen.

McMillen says the DLC's rocky launch left a bad taste in his mouth, so the team decided to do another content update. Wrath of the Lamb v1.3 adds 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."

The update is free to all owners of the expansion. McMillen concluded, "700k is a big number... maybe its time to bring this thing to console ;)"

This article was originally published on Joystiq.