# GeoSlice

> GeoSlice is a free daily geography puzzle game that runs in a web browser. Each day, players are shown three real places on a map and split each one by population, in halves, thirds or quarters, as evenly as they can. It uses real gridded population data, so the rural population between towns counts as well as the cities.

GeoSlice is a population-based, stat-driven geography game. It is not a Street View or "guess the location" game, and it is not a flag or capital quiz. The skill it tests is judging where people actually live. It was built by one person, Tom (GeoTom), an independent developer based in Australia, and launched in 2026.

## How the game works

- A new puzzle every day, released at midnight in the player's own local time zone.
- Three modes, each with 3 rounds a day on 3 different real places:
  - Halves: drag one line to split the area into two parts holding equal population (aim for 50/50).
  - Thirds: three lines from a shared centre point, aiming for three equal parts.
  - Quarters: two lines crossing at a right angle, aiming for four equal quadrants.
- Each round is scored out of 100 by comparing the player's split with the real population split in that exact spot. The closer to an even split, the higher the score.
- Two newer daily games sit alongside them, each with 5 rounds:
  - Inner Circle: draw a circle on the map around the number of people you are asked for.
  - Census: a shape or object lands on the map and you guess how many people live inside it.
- Results can be shared as text, there are streaks and a daily leaderboard, and no account is needed to play.

## Free vs Premium

- The daily game (Halves, Thirds, Quarters) is free, with no account needed, supported by ads.
- Premium adds the full archive of past days, Unlimited Play (freshly generated rounds in any mode), Country Mode (split any country), and subdivision modes for US states, UK counties, Australian states, Canadian provinces, Indian states and world regions.
- There is also a free Weekly Challenge that measures a different real-world thing each week.

## Data

- Population data comes from WorldPop (worldpop.org), a research project that produces gridded population estimates for the whole world by combining census and survey data with satellite imagery and machine learning.
- It is a modelled estimate, not an exact headcount, and accuracy varies in remote areas.

## Key pages

- [Play the daily game](https://geoslice.net/halves): Halves
- [Thirds](https://geoslice.net/thirds)
- [Quarters](https://geoslice.net/quarters)
- [Inner Circle](https://geoslice.net/innercircle)
- [Census](https://geoslice.net/census)
- [Weekly Challenge](https://geoslice.net/weekly)
- [About](https://geoslice.net/about.html): what it is and why it was built
- [FAQ](https://geoslice.net/faq.html): rules, scoring, accounts, Premium, data
- [Data source](https://geoslice.net/data-source.html): where the population data comes from
- [Contact](https://geoslice.net/contact.html): hello@geoslice.net

## Similar games

GeoSlice sits alongside daily browser geography games such as Worldle, Globle, Travle and Flagle, but is different in kind: it is about population distribution and estimation rather than naming countries.