VISIT DIABLO 2: LORD OF DESTRUCTION FORUM
View debug information:
Start a game, press [Enter] to enter talk mode, then type fps. The ping time, frame skip , and frames per second will appear in the upper left corner.
Join a Battle.net or other multi-player game and join a party. You and your partner will share experience. The more people in the party, the more experience everyone gets.
Use the following trick to get eight times the experience. The host of the game must do the following. Press [Enter] to enter talk mode and type players 8. Then, press [Enter] and type player 8 in a different message box. Note: Although you will get eight times the experience for each kill, the monsters will also be eight times stronger. You can gain experience quickly but you must be careful to avoid dying. Note: This trick only works off of realms.
When playing online, the easiest way to get to a higher level is to get to Act 5 then go to Blood Runs. To find out the name of the games, go to chan bloody and type norm if you are in normal, nm if you are in nightmare, or hell if you are in the hell difficulty setting. Wait for someone to give a name (for example norm=normbr). In the join game option type normbr and enter the game.
Secret Cow level:
Defeat Baal under the same difficulty setting that you are making the cow level in. Take Wirt's Leg (found in Tristram) and a Tome Of Town Portals and put them in the Horadric Cube. You must transmute them in Act 1.
Hint: Create a Javelin:
Put arrows and a Pilum inside the Horadric Cube. Click "Transmute" and you should have Javelins.
Hint: Create a Ring:
Put three Amulets in the Horadric Cube. Click "Transmute" and it will make a Ring.
Hint: Create an Amulet:
Put three Rings in the Horadric Cube. Click "Transmute" and it will make a Amulet.
Hint: Create a Full Rejuvenation potion:
Put three Mana potions, three Healing potions, and a gem of any kind in the Horadric Cube. Click "Transmute" and it will make a Full Rejuvenation potion.