Organisational culture is a long debated research field, one that is greatly influential in modern day workspace, possibly deeply affecting organisational performance. This thesis is a case study on Blizzard entertainment from 1997 to 2005, where Blizzard North and Blizzard South, two organisations, existed and worked on some of the company’s most influential games. The authors analysed and inspected the unique culture of each of the organisation, intending to understand the effect of organisational culture on video game development. The analysis is conducted utilising multiple organisational cultural theories and models. Both of the studios' organisational culture is explored in this study and the study aims to show the effect of these organisational cultures in the game development process. The importance of this research lies in studying the connection between organisational culture and the gaming development process. This research is for an audience which takes interest in starting their own company or working in one, people who want to understand how companies work and people who are interested to see different behaviours in different situations. The key findings of this study are about how organisational culture affects different aspects of game development such as design, approaches and relationships between peers.