Level 1-5:  Beginner

Level 6-10:  Occasional Traveller

Level 11-15:  Map Enthusiast

Level 16-20:  Globe-Trotter

Level 21-30:  Probably a Cartographer

Level 31 & Up:  PhD in Geography

Source code for this map is on GitHub.
It was designed and built by Jeff Allen in 2017 (updated in 2022 at the School of Cities) using Mapbox and QGIS, with data from OpenStreetMap and Natural Earth.