Real charts. Your intuition.
Loading play history…
Draw What Happened Next in Extraplot
Extraplot shows you the beginning of a real historical chart. Draw your guess for the missing stretch, then reveal the actual data and see how closely your line matches.
How to Play Extraplot
Each chart has a visible section and a hidden section. Use the visible data, dates, and scale to decide how to continue the line.
1
Choose a Category
Pick one topic or select All categories to draw from the full question bank. Each set contains up to five randomly selected charts.
2
Draw the Missing Line
Start at the dotted cutoff and draw across the shaded area to the right edge. Draw over any section to revise your guess before submitting it.
3
Reveal the Actual Data
Select Reveal when your line is complete. Compare your guess with the actual trend, see your score, and open the source link to learn where the data came from.
4
Review the Set
Finish the remaining charts to see your total. Open a result to compare the lines again, or return to the category picker for another set.
1
Choose a Category
Pick one topic or select All categories to draw from the full question bank. Each set contains up to five randomly selected charts.
2
Draw the Missing Line
Start at the dotted cutoff and draw across the shaded area to the right edge. Draw over any section to revise your guess before submitting it.
3
Reveal the Actual Data
Select Reveal when your line is complete. Compare your guess with the actual trend, see your score, and open the source link to learn where the data came from.
4
Review the Set
Finish the remaining charts to see your total. Open a result to compare the lines again, or return to the category picker for another set.
Read the Clues in Every Extraplot Chart
Start with what the chart tells you: its topic, dates, units, and visible pattern. Use those clues to decide how the missing line might continue.
Check the Vertical Scale
Read the axis labels before judging the steepness of a line. A small change in value can look large when the chart covers a narrow range.
Look at the Full Visible Pattern
Check whether the visible line rises steadily, repeats a seasonal pattern, or swings between peaks and dips. Use that pattern to decide where your guess should change direction.
Refine Your Guess
Use Undo to remove your last stroke or Clear to start the chart over. You can revise any part of the shaded section before selecting Reveal.
See How Your Extraplot Guess Compares
Reveal the actual trend alongside your guess, see where the lines match or diverge, and check how close you came with your score and average miss.
Your guess appears in pink and the revealed data appears in green. The space between the lines shows where your prediction was too high or too low.
Each chart is worth up to 1,000 points. The result also shows the average distance between your guess and the actual values across the hidden section.
The source link appears when you reveal a chart. Open it to find the original dataset and check what the series measures.
The set summary lists every chart and your total score. Open an individual result to review your prediction and the actual line.
Explore Five Categories in Extraplot
Discover more than 100 real charts across stocks, climate, population, earth science, and technology & energy. Focus on a favorite topic or mix categories to try a different kind of trend each round.
Compare Short and Long Time Spans
Try Stocks for daily closing prices, then switch to Population to read changes in fertility, life expectancy, or the share of people living in cities over longer periods.
Look for Different Patterns
In Climate, compare seasonal patterns in atmospheric carbon dioxide with shifts in sea ice. In Earth Science, try charts of earthquake counts, volcanic eruptions, and tsunamis.
Explore Technology Adoption and Energy
Choose Technology & Energy to compare how internet use, mobile subscriptions, and electricity generation from sources such as wind and solar changed over time.
Track Which Charts You Have Played
Open Play history to see your latest score, best score, and play count for each completed chart. Turn on Exclude played charts when you want a set of questions you have yet to reveal.