An IB Geography classroom game for the demographic transition (syllabus 1.2.1). Each round draws four countries, one from each of stages 2–5, as anonymous birth-rate, death-rate and population graphs on identical axes. Students read the curves and drag each country onto the graph they think it is. The gap between the two rates sets how fast the population grows, but the stage shows in how the lines move: in stage 2 the death rate is still falling steeply; in stage 3 it has levelled off while the birth rate falls; in stage 4 both are low and close together; in stage 5 the death rate has crossed above the birth rate. Feedback is score-only, so the reasoning has to come from the graphs. Data: World Bank World Development Indicators, 1960–2024.