Can you get all 10 of today’s comparisons right?
Every day brings 10 comparisons from one category, the same for every player. Unlike the endless higher-or-lower games, a wrong answer does not end the puzzle: play all 10 rounds, get a score out of 10, and share it.
How to play
- Today’s category is named in the bar at the bottom of the board. It changes every day, in a fixed order: country population, mountain heights, country area, scale of the universe, building heights, life expectancy and GDP per person.
- Two cards appear side by side (stacked on a phone). The left card shows its value; decide whether the one on the right is higher or lower, or larger or smaller for areas and sizes.
- The hidden value counts up and your answer is marked right or wrong. Either way, the right card moves across and the next comparison begins. There is no timer.
- Your score is the number of correct answers out of 10; the dots in the bottom bar show each round as you go. Progress is saved in this browser, so a reload picks up where you left off.
- When the tenth round is done, share your result as a row of green and red squares, then see your statistics: puzzles played, average score, your streak of days played and the score distribution.
- A new puzzle starts at midnight in your own time zone, and everyone playing on the same date gets the same one.
Understanding the comparison
Think in orders of magnitude before details: is the right card ten times bigger, or about the same? Close pairs are preferred, so most rounds are not give-aways, and two values that would read the same are never paired.
Frequently asked questions
Does a wrong answer end the game?
No. All 10 rounds are played whatever happens, and your score is the number you got right. For an endless run that stops at the first mistake, play one of the regular higher-or-lower games.
Which categories does it use?
Seven, one per day in a fixed order: country population, mountain heights, country area, scale of the universe, building heights, life expectancy and GDP per person. Each uses the same data as its regular game on this site.
Is everyone’s puzzle the same?
Yes. The category and the 11 cards are chosen from the puzzle number, so everyone playing on the same date compares the same pairs. The exception is a data update on the day, which can change some of that day’s cards for anyone who starts after it; a puzzle already started keeps its cards. If a category’s data cannot be loaded or is past its freshness limit, the puzzle switches to scale of the universe (69 objects that ship with the game), so it can always be played.
How does the streak work?
It counts the days in a row on which you finished the puzzle, whatever your score. Your progress, statistics and streak are kept only in this browser; there is no account to create.
Where do the values come from?
From the same data as the regular games: World Bank indicators for population (2025, 195 countries), area (2023, 194 countries), life expectancy (2024, 195 countries) and GDP per person (2025, 182 countries); 32 summit elevations from national mapping, park and tourism agencies and UNESCO; 32 architectural heights from CTBUH / The Skyscraper Center; and 69 object sizes from NASA and the reference cited for each object. Each card names its own source and image credit under How to play.
How each day’s puzzle is chosen
The day’s category follows the seven-day rotation. Its items are shuffled with the puzzle number as the seed, and 11 are drawn in a chain so that each card is compared with the next. Pairs whose values are too close to call are skipped (mountain heights must differ by at least 20 m and building heights must differ by at least 10 m), and pairs within about 1.5 orders of magnitude (2 for the universe) are preferred two times in three.
Practise with the endless games
Each category has a regular game with a streak that ends at the first mistake.
Sources
Source: World Bank and other sources
Each day uses one category, from the same verified snapshots as the regular games: World Bank indicators for population (2025, 195 countries), area (2023, 194 countries), life expectancy (2024, 195 countries) and GDP per person (2025, 182 countries); 32 summit elevations from national mapping, park and tourism agencies and UNESCO; 32 architectural heights from CTBUH / The Skyscraper Center; and 69 object sizes from NASA and the reference cited for each object. Once the puzzle loads, the provider, data period and collection date of the day’s category appear here, with a source and image credit for each card under How to play.
Found an incorrect answer or a source that needs updating? Send a correction with the game name and a reference.