Q: The game asks for a registration code.
A: Download the latest version, it doesn't require any registration.

Q: How do I shoot?
A: To fire a missile your targeting system must lock the enemy (you will see a square around him). It will happen if the target is close enough and in front of you.

Q: What is ZRK?
A: Antiaircraft defence complex.

Q: The game doesn't work properly on [device name].
A: I don't support the game anymore. You can take the source code and try to solve the problem yourself.