A no-prep statistics lesson built around the Chrome dinosaur game. Pupils play a 30-second round, record five scores, and calculate the mean and range. They then compare their class average against real site-wide player data — where the typical (median) score sits far below the mean — opening up skew, outliers, and why the mean can mislead. Mapped to the National Curriculum (Year 6 statistics; KS3 data). Includes teacher plan and pupil worksheet. The game used is free, ad-free, requires no logins, and collects nothing about pupils.