Battle Isle is a one or two player war game. Unfortunately it has eluded most players about how to play against the computer. It's surely buried somewhere in the long documentation file. The game defaults to two player mode. Select "OPTIONS" with the mouse to get to the options screen. Click on the word "FIRST". That is the first level of the two-player codes. Type in "CONRA" or code for any other game level that you wish to play. Then select "EXIT" to play the game.