To get a FREE Origin key, you need to:
- Visit Rocket Arena support page on EA website
- Select PC Origin platform (it doesn't work for Steam)
- Select "Codes and promotions" topic and then "Promotion questions" issue
- Enter "LETSROCKET" code
- Fill the required information ("Subject" and "Please describe your issue") with code LETSROCKET
The Origin key will be sent to email used in support ticket. Enjoy!