The Montreal XYZ Challenge is on an entire community of creators, developers and users interested in the ever improving techniques of acquisition, digitalization and exploitation of LiDAR (Light detection and ranging) data. Generating very dense point clouds of extreme precision, the LiDAR surveys lead to the creation of 3D urban environments. The challenge is all about using this enormous set of data to explore new application potentials or usages for digital arts, geomatics, engineering, artificial or immersive intelligence, urbanism and more… The ultimate goal of the challenge is to favor collaboration amongst various communities and explore new technological limits. Students and researchers can partipate and also act as mentors.