
You want into the Secret Cow Level and the search results keep muddying a recipe that has not actually changed. Here is the clean version, no rumor padding.
The point most people miss is that the unlock is difficulty-specific. Clearing Normal lets you open Normal cows. For Nightmare or Hell cows you have to beat Baal on Nightmare or Hell first. There is no account-wide shortcut.
Before you touch the recipe, make sure the character opening the portal has actually killed Baal on the difficulty you want. Most “the recipe is broken” moments are exactly this: you beat Normal, jump into Nightmare, cube the items, and expect a portal before Nightmare Baal is dead.
In multiplayer, keep it simple. The character opening the portal must have that difficulty completed. Once the red portal is up, the whole party can use it — but the opener is the part that matters.
You do not buy Wirt’s Leg from a living Wirt. You go to Tristram and loot it from Wirt’s corpse. Any guide that talks about purchasing it for gold is not describing the cow-level process.

The route: take the Stony Field waypoint, walk to the Cairn Stones, and step through the red portal to Tristram. Inside, head to the northwest, find Wirt’s body, and click it to grab Wirt’s Leg. Pick it up and town out. You can repeat this in any later game whenever you need another leg, so there is no need to hoard it.
If your inventory is packed with charms, clear a slot before you go in. It sounds trivial, but on controller layouts the inventory shuffle slows repeat farming more than the actual combat does.
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Return to Act I and stand in the Rogue Encampment. Open your Cube via Inventory → Horadric Cube, drop in Wirt’s Leg and a Tome of Town Portal, then hit Transmute. A red portal to the Secret Cow Level opens nearby.
Use the Tome of Town Portal, not a loose scroll — that is the one detail people get wrong most often. If you do not have a spare tome, Akara sells one in the Rogue Encampment.

The portal stays open for that game session. You can go in, take a town portal back out, empty your inventory, and return. You will need to remake the portal in a new game, but you are not forced to do the whole run in one trip.
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This is the one mechanic worth getting exactly right. In classic Diablo II and Lord of Destruction, if you were present when the Cow King died, you were permanently locked out of opening the Cow Level portal again on that difficulty — the recipe simply stopped working.
In Diablo II: Resurrected, that restriction does not apply. You can kill the Cow King and still reopen the portal on the same difficulty, so you can farm cows freely without tiptoeing around the King.
Even so, do not treat him like a trash mob. His pack spikes damage fast if you charge into the middle with poor positioning. On a fragile build, clear the outer herd first, then collapse inward. The Cow Level punishes overconfidence more than it punishes low damage.

The reason people still run cows is density. The level is excellent for rune hunting, socketable white bases, gems, charms, and any build that scales hard with tightly packed enemies. Higher difficulties drop better, which is why beating Baal on Hell and farming Hell cows is the version most farmers want.
The whole loop is short once you strip away the bad shorthand: kill Baal on your target difficulty, loot Wirt’s Leg from Tristram, cube it with a Tome of Town Portal in the Rogue Encampment, clear, stash, repeat. The Cow King is no longer a one-time lockout in Resurrected, so the Secret Cow Level stays one of the most dependable farming spots in the game.