Lots of cope in these replies. You can easily look up youtube comparisons of these games to see how similar they are, even mechanically in many cases.
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https://techcrunch.com/2011/06/16/war-zynga-sues-the-hell-ou...
https://techcrunch.com/2011/07/20/vostu-goes-on-the-offensiv...
https://techcrunch.com/2011/12/06/zynga-vostu-settle-copyrig...