Not to be confused with Rookie's Anvil Background.
This background was released on March 28, 2011, for the April Fool's Party 2011. On May 5th, 2011, the background was taken out of the inventory, just like the Blue Puffle Hat and Stripped Puffle Jacket after the Puffle Party 2011. This glitch was fixed on May 19th, 2011. It came back during the Fair 2012.