In this paper, we detail a software platform that enables game developers to expose aspects of their games to researchers who are not necessarily familiar with game development, providing them the possibility to customize game content for behavioral user research, and more specifically to embed survey items in a game context. With this platform we introduce the concept of Games User Research as a Service (GURaaS). This articled describes the process we followed to design GURaaS, its high level architecture and its application in a case study. We envision that GURaaS will assist researchers and organizations by helping them expand their reach in finding participants and in collecting survey data reducing the tedium for survey participants.