3G Light Pen (Included game)

The Light Pen is a physical pen attachment that can be hooked up to the TRS-80 or Commodore PET as an in put device. The user can then interface with the computer (in compatible software) directly on the screen using the pen. The TRS-80 version comes with a demo game program of Tic-Tac-Toe. The game plays the same as the pen and paper classic, with players taking a turn putting their mark in a 3x3 grid with the goal of getting 3 marks in a row.