You can get the needed crystals not only buying them or receiving in battles, but also inviting friends in the game.
Besides, you get crystals not for the fact that you invited a new player but you are constantly given crystals for his
success and achievements.
How to invite friends?
In the upper panel press button "Invite a friend"
Copy the link and send it to friends/copy the banner code and add it to your site or blog.
Your current tank, rank, nick, score and rate position will be visible on the banner.
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