Type JUMCO (for Deluxe Version) or VHOEZ (for Standard Version)
at the Main Menu and then press any of the following cheat keys:

Code                 Result
-----------------------------
[CTRL]+[SHIFT]+F7  - Win Game.
[CTRL]+[SHIFT]+F8  - Lose Game.
[CTRL]+[SHIFT]+F11 - Add Credits.
[CTRL]+[SHIFT]+F12 - Unlock All Missions.