For any kind of game support (technical, in-game, bugs, etc.), please go to Support Tickets
For Nexus TK and Dark Ages, please go to Support Tickets.
If you believe your credit card was used without consent, please call 866-204-9931.
For Shattered Galaxy and Robo Smasher, Kru has partnered with Paymentwall to handle payment and billing transactions. You can communicate with them directly for billing support, Paymentwall Support