This paper reports on the development of a Multiplayer Browser Game realized in the course of the SpITKom project. The game has been designed to support the acquisition of IT knowledge for learners difficult to reach. In order to provide an engaging and motivating learning environment for the target group, the player-centred game development process has been guided by a pre-study and several testings. First results already indicate, that the game is being accepted as an intuitive and low-threshold learning offer. After briefly outlining the SpITKom project and its underlying pedagogical assumptions, we will introduce the initial study and present some of the recommendations that were deduced to guide the game design. We will then illustrate the SpITKom game design and the corresponding prototype and eventually present first results from the ongoing game testing that further determine the design of the final prototype.