In case you're catching up with all the different updates for this game, here's my curated list since the review, the updates are roughly every four weeks, meaning that occasionally there are two in a calendar month:

• January 2014 - a Miami theme, with collectible pink flamingos, bright green trains, pink structures and palm trees.
• February 2014 - a Seoul, South Korea theme, with collectible little robots, rivers, paper lights, spritely colors and new missions. 
• March 2014 -  a New York City ‘World Tour’ theme, with Shamrocks appearing on walls in anticipation of St. Patrick’s day, more power lines, brick buildings and a cop wearing NYC blues.
• May 2014 - a Vancouver, Canada theme, with a new character, 'Olivia the spirited girl scout', maple leaves to collect and a 'Moose board'.
• June 2014 - a Tokyo theme, with a new Windglider board and new Harumi and Ninja outfits. Plus there's a a notification system to tell you about new updates.
• July 2014 - a Paris theme, with another new character, Coco, a new 'Sci-fi Teleporter' board, plus support for devices with only 512MB of RAM (at last).
• August 2014 - a 'mystical China' theme, with 'acrobatic Sun' and hidden dragons to find.
• September 2014 - a Cairo theme, with Jasmine the 'adventurous princess'.
• October 2014 - a New Orleans theme, centred around Halloween, with Jack-o-lanterns at the sides of the streets and a 'grumpy cop' who is chasing in a Frankenstein's monster outfit.
• November 2014 - a Bangkok theme, with Noon, the elegant Thai boxer, Dino, the happy Facebook character, and a new Turtle board.
• December 2014 - London, baby, with a jolly snowman.
• January 2015 - a special Las Vegas theme (for CES), letting you 'surf beneath the star covered sky', with Rex, the amazing performer, a new Roller board and 'shiny Spades' to collect.
• January 2015 - a Seoul theme, with a new hip, pop character.
• February 2015 - a Hawaii theme, with a happy hula boy(!)
• March 2015 - a Mumbai theme with a new super-athletic character.
• April 2015 - a Paris theme, with all the tourist sights you expect.
• April 2015 - an Arabian theme, with an exotic dancer!
• May 2015 - a Los Angeles theme, surf around Hollywood movie sets!
• June 2015 - an Italian theme, with a gondola board around Venice.
• July 2015 - a Brazilian theme, with a search for colourful toucans...
• July 2015 - an Australian theme, with diving visuals and a 'wave rider' board.
• August 2015 - a Greek theme, surfing past the famous sights...
• September 2015 - a New York theme, all the feel of the famous city...
• September 2015 - a Kenyan theme, with a dancing Masai girl....
• October 2015 - a Transylvanian theme, spooky in all the right places for Halloween.
• November 2015 - a Japan theme, with lofted tracks and neon signs.
• December 2015 - a Hawaii theme, surf along the (literal) surf!
• January 2016 - a San Francisco theme and a new peace-loving hippy character.

That's an impressive programme of improvements, themes and features through the year. Subway Surfers remains some people's favourite Windows Phone game and it's easy to see why.