Kingdom Cash is an investment blockchain game with its official token $KING. Users can stake $KING on the website through a three-level system to earn rewards. Related projects include KingToken and KingZ Cash, which feature P2E gaming, AI integration, passive BUSD rewards, and KYC/Audit verification. KingZ Cash's presale is canceled but offered AI integrated games, and a marketing campaign, while KingToken's sale has ended. Both projects emphasize earning potential and community engagement.