Estimate with
a reference.
A useful guess starts with something you know. Check what is being measured, choose a familiar anchor, then make the size of your uncertainty smaller.
These are practice examples for Plain Game at plaingame.app, not answers to today’s flight. Each practice link opens a setup you can review before starting.
1. Check the unit and scope first.
Ask: height or length? Total population or a percentage? Food energy per 100 g or per serving? Confusing a unit can turn a reasonable guess into an answer many times too large.
For a fictional 2.4 km measurement, entering 2.4 in a field labelled metres is a thousandfold mistake: the equivalent is 2,400 m. Read the displayed unit before submitting. Settings can change display units; use what the question and input show. For a country statistic, also read the snapshot year and whether the measure is a total or per person.
Practise mountain heights → · Check this topic’s scope and source
2. Name a familiar anchor.
In a name question, you already know the target. Search your memory for an example near it, then use the suggestions to select a name the topic accepts. For a 6,000 m mountain target, Kilimanjaro at 5,895 m is a strong anchor: 97% base accuracy. Exact recall is useful, but a nearby reference can already earn most of the points.
If a name is unfamiliar, browse that topic’s accepted names before a timed game. The list gives you a vocabulary to work with; it does not sort names by value. Start with a single topic, then mix topics when your references become more reliable.
Practise naming a mountain → · Browse all topic lists
3. Narrow the range on the right scale.
Suppose you only know that a fictional value is somewhere between 100 and 400. With ratio scoring, 200 is equally far from both ends: twice 100 and half 400. The ordinary midpoint, 250, is 2.5 times the lower end but only 1.6 times below the upper end.
The geometric midpoint, √(low × high), balances the worst proportional error between two positive bounds. It does not guarantee the best guess: if you have evidence that the value is near one end, use that evidence. A range is a way to organize uncertainty, not a substitute for knowledge.
For sizes that span huge ranges, first decide the order of magnitude: tens, hundreds, thousands or millions. Then refine within that band. Try country-size estimates →
4. Use ordinary distance for years.
Years follow a different rule. If an event is somewhere from 1850 to 1900 and you have no further clue, 1875 balances the distance to either end at 25 years. Divide the interval using a remembered era or another event, then choose a whole year.
In this game, one year off earns 95% base accuracy; ten years off earns 61%. Only the exact year earns the 25-point bonus. The year scoring table shows why a near miss can still be useful. Practise book publication years →
5. Learn comparisons before exact numbers.
If you cannot estimate a value yet, practise deciding which of two things is larger. Sorting three answers adds a second step: check each pair, not just the smallest and largest. Partial credit comes from correct pairs, so one misplaced answer need not erase all your progress.
Compare animal weights → · Sort movie runtimes →
6. Turn the reveal into one correction.
After each answer, ask why it was high or low. Write a short correction you can reuse: “I confused metres and kilometres,” “I used a total instead of a percentage,” or “My reference was about twice too large.” Open the linked source if the scope is unclear. Values use a fixed snapshot, so a live search may show a newer number.
Use Relaxed practice to think without a deadline. Once comfortable, try Standard and compare unassisted accuracy. In daily play the first three seconds have no drift; a few extra seconds can be worthwhile if they prevent a large error, but the 30-second deadline is final. Explore the accuracy/time tradeoff.
A focused practice session
- Choose one topic and play seven untimed questions without hints if you can.
- Review the largest mistakes. Pick one cause to work on, rather than changing everything.
- Use weak-spot training for a baseline, coached practice and matched retest.
- Return for the scheduled review. A good immediate retest is encouraging; it does not prove lasting learning.
Choose a relaxed practice flight → · How training measures progress