Chromaroma is a London-based game using players’ public transport passes (Oyster cards and Barclays Cycle Hire accounts). Points are awarded depending on the stations and journeys users complete on the London Underground and London Buses, as well as using ‘Boris bikes.’
It is described by its creators, Mudlark, as ‘location-based top trumps,’ and encourages competition through leaderboards. (Top Trumps is a card game. Each card contains a list of numerical data, and the aim of the game is to compare these values in order to try to trump and win an opponent’s card. A wide variety of different packs of Top Trumps have been published).
The Daily Omnivore 
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