I use a Visa card and have had no problems at all, you need crystals to play, i don't know how you have got your rank without purchasing crystals you must have taken a longgggggg time to do so.

Why did the Tanki game change from using all three weapons to just one?? A lot of my friends don't play tanki now because of all the changes, they liked it the way it was! I still play and love the tanki game but it was FAR better before :(