VIP benefits includes Unlimited Best Match challenges, Ad free, Unlimited Chat, Unlimited Adama games, Unlimited Custom Board Designs, plus up to 25 games at the same time, see the Best Match profile images and Statistics, see stats in search results and Facebook friends.
Coins are used to buy boards or powerups, and you can do very well without any coins. :) Hope this answers your questions.
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You might also want to try our other Top Rated Games: Hyspherical, Crossed and Ninety8.