this is a good way to play the game for upgrade pattern 1st u have to upgrade the following in this order cannon,unit,shield,thrusters. do this and u wont have any omg my base is almost killed problems. after they all reach to where they cost 100 get the following in this order 2nd cannon,rockets,tri shot,and rep. shield. then u can go after the layers of the big orbs easely. hit plus if it was a help to u.
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