To defeat Final Boss - Mothership - in NORMAL MODE :
Make only Missile Turret upgrade to final upgrade, at least 10 for the last level.
In front of the Missile Turret Line, build a "NET" of connector to occupe the Mother Ship ( it is not expensive). When the MS destroys one of them, rebuild it, indefinitely.
Be patient, and if you lack of cash, sell one of your Missile turret.
You will encount 3 MS in the final stage ... with HUGE LAG !
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