Unlock Unlimited Missiles & Options
Finish 20 missions on normal difficulty and get a Special setting in the options menu
Extra Fighters
Finish 20 missions and you will get extra fighters such as Sea Harrier, AV-8B Harrier II, F/A-18C Hornet, F-15E Strike
Eagle, S-37 Berkut, MiG-1.44 MFI.
