War Tank is one of the three skins released under one part of the Arcade Games offer. It could be individually purchased using game coins in mid August 2017.
War Tank could be purchased in the Skins Shop under the 'Arcade' tab for 2900 coins. It was available for a limited time and may not be available for purchase in the future.
Details of this offer can vary depending on location, platform or time.
Note: This part of the Arcade Games offer has been released multiple times since its original debut in 2017. The price for War Tank remained the same at 2900 coins for every release.