Steel Battalion
Unlock Select Mode:
Use the tuner to point to the following numbers at one second intervals between each one:
1, 9, 7, 9, 0, 9, 0 and 6.
A sound will confirm correct entry of the code.
Unlock Full Screen Mode:
Get 55,000 Command Points to unlock Full Screen mode.
Desperado Mode:
Complete mission 23 on Veteran difficulty to unlock Desperado mode.