Edmund McMillen says he didn't expect a game like Binding of Isaac to sell 700,000 units in its first year, as he rolls out another update to the Wrath of the Lamb expansion.

There's surely no better place to spend your Memorial Day holiday than a dank basement, so slap down $3 for The Binding of Isaac's DLC expansion Wrath of the Lamb. Out today, it adds new chapters, enemies, room types, items, and a final (final) boss.