Players each have a hand of cards, each representing stations on the London Underground. Each card displays the coloured underground lines served by that station. Some stations will be intersections of multiple lines, others will be on a single line. The first player places a card face up and players in turn play cards that are on a line that matches that of the previous card. If they cannot lay a card, they take a card. The winner will be the first player to exhaust their hand. There are special cards that use phrases that will be well known to London Underground travelers and which will affect game play. For example, 'Planned Engineering Works' lets a player to specify a line that is 'closed' and so cannot be played until that player's next turn. The short rules comes with a variant that allows multi-game scoring.
The cards replicate the iconic design of the London Underground map, and the game is officially licensed by Transport for London. It is contained in a tin box that replicates the London Underground symbol (red circle crossed with a blue bar).