A secret cow level is now available in Diablo III, but for a limited time only.

As part of the game’s third birthday celebrations, Blizzard has placed the level in the PC, Xbox One, and PlayStation 4 versions of the game.

To enter the level, kill the Elite cow enemy Herald of the Queen, who randomly appears from time to time.

That will open a portal to a place called Not The Cow Level, through which there are chests, cows, an event and a Cow Queen to tackle.

The level will be available until May 21.

The Secret Cow Level debuted in Diablo II.

Xbox 360 and PlayStation 3 players aren’t completely left out: if you have the Ultimate Evil edition of the game, you get double EXP and Gold.