Costle hands you a receipt from a mystery country. It starts with the price of a Big Mac in US dollars, and every wrong guess prints another line about how expensive the country is.
From The Economist's Big Mac index and the World Bank's World Development Indicators.
Yes. In hard mode the currency line never prints. Hard-mode wins show a star in the shared result.
Yes. All four games are free to play in any web browser, with no account or download needed.
Each game has one new daily puzzle, and it unlocks at midnight in your own time zone. Everyone in the world gets the same country on the same day.
Yes. Every game has a practice mode with unlimited random rounds, and practice rounds earn XP towards levels.