Yeah I found out there was an app last night too, I've played it a bit, but I find it much better with a mouse! Weirdly enough I messaged my sister om Facebook telling her to play and she was literally on the game at that moment, freaky, she prefers Agar.io though which is similar to a point.
I got fairly big on it yesterday and reached around #5 on the leader board. The biggest I've seen was over 70,000 somehow; not sure how someone can do that, might be very skilled and have enough time on their hands to keep going for that long .
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