Ace Combat 4 - Platform: Playstation 2
    
Bonus Options
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Complete all 18 missions then save the game. Load the 
saved game to unlock Special Continue, 
Free Mission, Trial Mission, Scene Viewer & Music Player. 

Unlock Expert Mode
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Beat the game in Hard Mode. 

Unlock Ace mode
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Beat the game in Expert Mode. 

Unlock the x-o2 stealth
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To unlock the x-o2 stealth, get a rank of "s" on all 18 
missions under the normal mode. In order to get the second 
x-02, finish the game getting an "s" rank under the hard 
difficulty setting. This will unlock a black plane. 
Finish the game under the expert mode and this will unlock 
the last x-02, this one is silver but once again you are 
required to recieve an "s" on all missions.

Unlock the tiger striped F-4E
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You can also get the tiger striped F-4E by completing the 
game once under any difficult setting, then using the sp. 
Continue option. 

Easy Yellow Destroying
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Once you obtain the QAAMs for any ship, use them on the 
yellows. They will continue tracking them down until they hit.