Ace Combat 4: Shattered Skies
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Unlock Second Plane Colors:
Beat each mission in normal difficulty with an S-rank to unlock the secondary color for each fighter. By shooting down the aces you get the 3rd. You don't need to pass the trial missions for the 2nd colors.

Different Colors-Ace Locations:
To unlock the different colors for the planes there is an ace placed in each mission that you must find and shoot down.
Here are the planes and locations for each mission.

1. F-5 just north of the allied airbase
2. A-10 north of the enemy airbase
3. F-16 south of the second radar station (the western most one)
4. Mirage 2000 Northwest of the westernmost radar jamming plane
5. MIG-29 south of the far western pumping station on the map
6. F-14 north of the northernmost group of enemies on the map
7. TND-IDS north of the solar tower
8. F-18 after refueling during the mission the ace will appear to the east of the main combat area
9. F-15C north of the center beach combat area
10. RF-01 far upper northwest corner of the map, northwest of the sub base
11. SU-35 the ace will appear with about 90 seconds left during this mission
12. F-2 north of the stonehenge gun base
13. F-15E after clearing the radar balloons, enemy fighters will appear, the ace is in the north east
14. F-22 Ace is in the north east of the map
15. EF-2000 Ace will be in the center of the map when the mission starts (between the two southern combat zones)
16. F-117 Ace is located northwest of the westernmost combat zone ( due to stealth sometimes hard to find, head 2 grids north and 1 west
17. F-15A ace is located in the far northwestern corner of the map, past the city
18. S-37 the ace is located north of megalith

The F-14 is available after completing hard mode, the X-2 is available after completing expert mode.

The aces are sometimes hard to see on the radar since you need to be close for it to show up. When you do find them they will be red on the radar instead of the usual enemy fighter colors of yellow or orange.

Secret Options:
You can get secret modes by beating the game. beat the game in any difficulty to acquire Special Continue, trial missions, FMV sequences, 36 songs from the game, and be able to change the color of your aircraft.

Hidden items:
Beat the game on normal and get an S rank for every mission to unlock all the aircraft

Beat the trial missions with all S ratings in order to unlock one of each aircrafts' two alternative color schemes.

Ace Difficulty:
If you beat Expert, you will be awarded the Ace Difficulty, If you miss any missions without getting S ranking, you won't have the X-02 for this setting.  
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