Ace Combat 4
Ace DifficultyComplete Expert difficulty to unlock Ace Difficulty.
Unlock 2nd color scheme
Complete every mission with "S" ranking on normal difficulty to unlock 2nd color schemes.
Unlock 3rd color scheme
Defeat every level ace to unlock the 3rd alternate color scheme. Aces will show up as red blimps on your radar. They only show up on your radar if you are really close to them. The aces are the following:
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 westernmost 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 northenmost 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 stonhenge 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.
19.F-4 unlocks after completing Hard difficulty.
20.X-2 unlocks after completeing expert difficulty.
Unlock all three X-02 planes
Complete the game on Hard with ''S'' ranks for all missions to get the gray X-02. Complete the game on Expert with ''S'' ranks for all missions to get the black X-02, and the same on Ace for the white X-02 plane.
Unlock bonus modes
Complete the game on any difficulty to unlock Special Continue, Trial missions, FMV sequences, 36 musics selections from the game, and color scheme change option.
