Proxx is an interactive web game developed by the Google Chrome Labs team, inspired by Minesweeper, which showcases building dynamic and performant applications with web technologies. The app leverages various technologies such as Preact, Rollup, WebWorkers, WebGL, and Canvas for optimal performance without sacrificing capabilities. Its source code is open-source and available for learning purposes. Proxx is being featured at Google I/O 2019 as part of a session on building fast and smooth web apps, and can be accessed through the proxx.app website.