The Armor of Hell
Open the chat dialogue box by pressing "Enter." Type "666stongcha666" and send it by pressing "Enter." Save the game and log out. Log back in with the same character you were using and put six jade stones, six rare pieces or armor, six normal non-throwing weapons and one perfect gem into the Horadric Cube. Transmute them and attain the Armor of Hell. The transmutation has a 79% chance of success.
Free Gold
Open the chat dialog and type "your gold is my gold X," where "X" is the amount of gold you want. Press "Enter" to submit the command and receive your gold.
Atheral Item Repair
Atheral items cannot be repaired during normal gameplay. To make them repairable, open the chat dialogue and enter "magicks magicks magick." Atheral items will be repairable in the Horadric Cube when you transmute them with a chipped gem.
Experience Cheat
Open the chat dialogue and enter "/player 8." The strength of the monsters will be set to the strength setting when eight players are participating. The experience will be adjusted accordingly so you will level very quickly as long as you can survive.
Starting New Characters Ahead
Right-click on the Diablo II shortcut and select "Properties." Add a custom command in the "Target" box with a preceding space after ".exe" to cause the game to start new characters at different spots in the game. The format for the command is "-actX," where "X" is the act in the game where you wish to begin. Diablo II has five acts. If you start in Act 1, your character will be Level 1. It will be Level 16 in Act 2, Level 21 in Act 3, Level 27 in Act 4 and Level 33 in Act 5.
The Cow Level
The Cow Level is a secret level in Diablo II populated only by cows. Acquire Wirt's leg and kill Baal. After he is dead, transmute a Tome of Town Portal with Wirt's Leg in the Horadric Cube to attain a scroll that opens a portal to the Cow Level.