Onslaught

At the title screen, press A, B, B, A, C, A, B. It should say CHEAT MODE at the bottom right of the screen.

Enter the following code at the Password Screen....

0000 - 0000 - 00

Then you should have all but the last territory conquered

Choose Password and enter zeros for all the number positions. When you start the game, the map will be covered with territories you own.