While it's a popular joke in Diablo 4 Gold Blizzard games that there's no cow level, it's been discovered that there is a hidden Cow level within Diablo 4. It has some very powerful enemies and might even have some valuable loot. But due to the game's randomness, it's dependent on luck to determine what players can expect to get useful.
It's not something players simply stumble across. There are specific steps and objects to reach the secret cow level, and if players don't know how to make the secret cow level appear, it's likely that they'll play the entire game only to never be able to see it.
The first thing players have to do is beat Diablo 2's final boss , which is the difficulty level they're playing at. The majority of the time, this will be Baal because generally, players elect to play with the expansion. You can go back to the cheap Diablo IV Gold base game with the addition of expansion, and if that's the scenario, players have to defeat Diablo.