The aim of this study was to find out what are the success factors of game industry crowdfunding campaigns. A theoretical model of the most important success factors and their relationships was created based on previous research and tested by interviewing the creators of three different game industry crowdfunding campaigns. The six major success factors that were discovered from interviews and previous studies: campaign rewards, campaign goals, quality of both the product and the campaign, the project team, the community of crowdfunders and the preparations for the campaign. The findings of this study and the success factor model can be used both as a tool for planning crowdfunding campaigns and as a basis for new studies regarding game industry crowdfunding campaigns.