Wizardry: Proving Grounds of the Mad Overlord/Secrets

Pooling gold
When you begin a new game, the amount of gold you start with is somewhat minuscule, allowing your characters to buy only the most basic weapons and protection. The more valuable wares are naturally kept out of reach until you fight more powerful monsters and earn more gold. However, if you would like to have a head start with your gold, you can create five dummy characters. Create a party with one character you intend to keep and the five dummy characters. Enter a camp and have each dummy character pool their starting gold with the real character. Then delete the dummy characters and repeat this process until the character you keep has amassed enough gold for your purposes.

Bishop Identify bug
There is a bug in the game that allows players to use their Identify ability to cause very unusual and lucrative events. Normally, the Bishop is permitted to identify any of the items in his inventory, which has a maximum capacity of eight items. When asked what item you would like to identify, normally you would press a number from 1 to 8. However, there are a few other input options that have unexpected results.
 * 9: If you attempt to identify item #9, you will award yourself with 100,000,000 experience points.
 * s: If you press the s key instead of a number, you will award the player below the Bishop in your party member list 100,000,000 experience points.
 * j: If you press the j key instead of a number, you will award the player below the Bishop in your party member list 100,000,000 pieces of gold.

Apple IIe: Infinite level gain
The Apple IIe version of the game has a specific bug that permits players to earn infinite increases in level simply by inserting a blank disk in the disk drive when you rest at an Inn. The first few levels are accumulated very quickly, and slows off as the levels increase.