Wizardry: Proving Grounds of the Mad Overlord

The so-called "New & Improved Version" was a later, updated release of the original Apple II and PC Booter release from the early 80's. Unlike to original release, featured a larger graphic window and slightly more colors, depending on the computer.

Rather infamously, the MS-DOS version introduces a bug where upon leveling up, there was a small chance a characters stats would decrease.