This report is a product of our examination work on Bachelor level in Interaction Design. Our aim is to develop a prototype of a learning game in mathematics for target group grade 4-6. The game will explain why mathematics is important and connect the subject to reality by giving the student tasks which they can relate to. In this report we present a theoretical basis by giving a background and context description of the problems in school today regarding learning and motivation in mathematics, children and computers and school and computers from a gender perspective. We will also describe three different areas in Interaction Design: Learner-Centered Design, Computer Supported Collaborative Learning and Motivation in Creative Digital World. We present a game concept based on theoretical findings, field studies and usability tests. The design process will be described and motivated and the result will be evaluated as well as discussed.