MeshMap is building a 3D map of the world through community submitted 3D scans rewarded by token incentives and fun gameplay. As a first proof of concept, we created City Champ, a mixed reality first-person combat and tower defense game developed for Meta Quest 2/3/Pro using Unity and Solana. As a player, defend your city from ghoulish creatures borne from urban social problems. Blast enemies, defend the city core, and collect reforms to win. As a scanner, scan the meshes for new play areas using your phone's built-in LiDAR scanner and submit to MeshMap to add endless level location possibilities.