Getting into The Secret Cow Level isn't about finding it, you will need to find Wirt's Leg Tome of Town Portal Horadric Cube Finding Tristram Tristram's red Portal is found in the middle of Cairns Stones inside the Stony Field once you have opened it within the 3rd Quest line in Act 1. Cairns Stones will always be close to the road that connects the Cold Plains using the Underground Passage....