how to play the old version where you can buy change nickname?
You cannot play flash version anymore. The game has moved to HTML5.
If you want to change your nickname you have 2 options.
1: email firstname.lastname@example.org and request a name change. you need 2000 tankoins in your account.
2. wait for the rename feature to be added to HTML5. It will be added soon.
Let me know if you need any more assistance.
Customer support service by UserEcho