I’ve been playing tanki online for the past few days. It’s pretty competitive, when you have so many with higher ranks than you, with better tanks and weapons.
So.. I made some research. :) Since with crystals you can buy better tanks and weapons I though there must be a good way of getting them. This way I bumped into cheats and hacks. I tried a few dozens of cheats and hacks with no success. The only that has valuable info on how to hack tanki online is http://tankionlinecheats.tumblr.com.
Hope this will help you as well.