All weapons:
Pause the game and press Up,
Right, A, Down, Right, A, C, Left, Up, B, Up, Right.
Thunder Force 4: STYX fighter:
Successfully complete Thunder
Force 4 with one credit. Save the game when prompted, and a special code will
be displayed. Enter the code at the Thunder Force 4 title screen to use the STYX
fighter from Thunder Force 3.
