The document describes the format of a coderetreat event with 90 coders and 2200 passionate software developers. The format involves periods of deep coding practice and challenge, receiving feedback without pressure, and experimenting freely. Sessions involve 45 minutes of coding, 10 minutes of retrospectives, and breaks in between. Coding tasks follow principles of passing all tests, clear intent, no duplication, and no superfluous parts. Code is deleted after each session and paired programming is used. Variations on the tasks are described. The Game of Life simulation is provided as an example coding task.