Guide the blue circle around the arena, defending it against all the enemies. progress to the next wave by completing bonus rings. look out for points rings for a points boost, and unlock rings which need to be collected in order to progress. beware of the orange mine rings, which will destroy you on contact. upgrade your weapons to defeat the powerful enemy variations, and boost your speed to successfully traverse the moving minefields. surviving all 25 levels will not be enough to top the leader boards, a constantly decreasing multiplier will mean speed is key to a massive score!
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