Extraplot

Extraplot is a daily chart-drawing puzzle. Every day you get a real historical dataset with the last stretch cut off, and your job is to draw where the line goes next. Your curve is scored against the actual data, so you learn how trends move — inflation, populations, temperatures, markets — by predicting them yourself instead of reading about them. Free to play in the browser, one new chart every day, with past rounds kept so you can track your accuracy over time.