Sets in the theme are based on the twelfth season of Ninjago, subtitled Prime Empire. Prime Empire, called Unfinished Adventure Game, is a legendary arcade game programmed and tested 30 years ago. The ninja entered Prime Empire to rescue the people who were captured inside the video game. The Key-Tanas are the collectible items within the sets, and most of the sets are based on the ninja's new vehicles from this season. Arcade Pods were also introduced.
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