There is a tutorial in the game - go and play that for instructions. ALL LEVELS IN THE GAME ARE POSSIBLE, but the last level on each section is very hard, to give people who are really good at the game a proper challenge. Also, the normal levels get progressively harder throughout the game. If you find any glitches please post them in the comments for me to look at. Coming "soon": A timer for aircraft changing roles. A timer for spotters A 7th aircraft Sounds? More aircraft and enemies for the modern level.
