To get up to Level 99 quickly (which gives you a trophy by the way), I recommend going to The World That Never Was and scale up and down from The Altar of Naught to the Proof of Existence with Final ...

This page is part of IGN’s Diablo II Wiki guide and details a complete step-by-step walkthrough of everything you need to know about accessing the Secret Cow Level in the game. You can find a complete ...