X-Band Modem

Maze mini-game

Press Down(2), Left(2), Right, B at the main menu.

Blockade mini-game

Press Up(2), Left, Right, Left(2), Right, L at the main menu.

Alternate screen

Press Up(2), Left, Right on the title screen.

Screen saver

Press Left, Right, Down(2), R at the "X-Mail" and "Newsletters" screens.

Change screen font

Enter the following controller actions at the player selection screen:
Rainbow font: Press Left(2), Up(2), Right(2), Down.
Green and yellow font: Press Up(2), Right(2), Down(2), Left.
Searchlight font: Press Down(2), Left(2), Up(2), Right.