If you're looking for more gift codes or want to stay up-to-date on the latest Defender 3 news, be sure to follow the game's official social media channels or forums."
In early 2019, the official Defender 3 Facebook page ran a "10,000 Likes" campaign. They posted a single-use code (e.g., DEF3K1NG ) that gave 100 gems and 5,000 gold. The code was active for only 48 hours. defender 3 gift codes 2019