Leading UK courier company Parcel Hero approached Octophin Digital with the task of create a fun but challenging online puzzle game to drive social media engagement and traffic back to their website.

Based on puns and visual clues, there are 100 world cities hidden within the completely original illustration. Users must zoom in and pan around to explore the intricate image to discover clues to solve.

If players get stuck on a clue there are quick ‘share’ buttons for them to ask their friends on Facebook and Twitter, helping the puzzle to spread virally across social media.

Players can save their progress using social media integrated logins so that they can come back to try and join the #100club – the elite group of people who have answered all 100 clues correctly.