I'm not sure why so many people have trouble with level 10, instead of acting like a 6 year old looking for instant gratification just attack the red one and wait it out and while it splits its resources, it'll eventually bleed out and you can over take it. From there you can just wait as the black and purple fight for the center one and you can over take them in no time.
I just pulled a meteor shower that got two guys on opposite sides of the map on opposite sides of the planets. It was so epic my browser froze soon after it happened. True story.
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 "Tentacle Wars. The Purple Menace"){kind=icon}
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 "Gravitee Wars"){kind=icon}