It is the first time the Washington-based company has appointed an agency outside the US.
Peter Bowles, creative MD for Dynamo, said: 'WildTangent has had great success so far in the US, and we'll be looking to build on this in the UK and EMEA, through media and influencer relations, targeting advertisers, developers and consumers.'
The company offers web-based games on PCs, with more than 175 million monthly users. It is also developing an android-based system for T-Mobile in the US.