1. View debug information:
Begin a game and push ENTER to go to the talk mode, now type fps. The ping time, frame skip , and frames per second will appear in the upper left corner.

2. Sound debug:
Push ENTER to open the chat screen, then submit (type) SoundChaosDebug and you will hear a sound to confirm you have entered the code correctly. To return to normal, repeat the code.

3. Get more experience:
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.

The players 8 and player 8 trick does work for single player by just typing them in and prepare for some tough enemies.

4. Secret Cow level:
Beat Baal under same difficulty 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.

5. Get any item
Use this trick to get almost any desired item. Go to the person in your highest Act that gambles (for example, Gheed or Jamella). Go to gamble. A list of good items will appear. If you do not see anything desirable, exit, then go to gamble again. There will be a new list of items for sale. Repeat the process until you have found what you want.