Rules are pretty easy. You are besieged by the enemy
and have to defend your position. Your fortress is
located in the middle of the screen. Enemies appear at
regular intervals and shoot at you. Your aim is to
destroy them before they have fired. If they have
already done so and if you are fast enough, you may be
able to destroy their missile before it hits you. Your
fortress is strong enough - it can bear up to four
strikes from each side before it gets destroyed. There
is more to it - you have a shield that reflects the
enemy's bombs.

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