DokuMetro stations
Metrodoku is a daily game that crosses the idea of sudoku with the metro map. The grid has nine cells. Every row and every column carries a criterion, and the cell where they meet wants a station that satisfies both. Northern line crossed with Zone 1: Angel works, Morden doesn't.
A new grid comes out every day, the same one for every player. You get three lives and a score that rewards rare answers: everyone answers King's Cross, answer something else. Free play generates as many grids as you like, from easy to expert, so you can practise without waiting for tomorrow.
The sixteen lines of the Paris Métro and RER interchanges, terminus stations, arrondissements, left bank or right bank, stations inside or outside Paris, automatic lines, elevated stations, nearby landmarks, the saints, battles, women and foreign places the stations are named after, the opening era, plus the first letter and the number of words.
Underground lines, fare zones, interchanges with the Overground and the mainline termini, the Thames and its banks, above-ground stations, step-free access, opening era and nearby landmarks, from Big Ben to Wembley.
Subway lines and their letters or numbers, the five boroughs, terminus stations, elevated stations, accessibility, the Manhattan core, construction era and iconic places, from Times Square to Coney Island.