Gamification is widely used and explored for improving learning and increase motivation. However, it has not been further explored in the context of software engineering managerial decision making, as a supportive tool in engaging both the individual and the team when making managerial group decisions. By applying a framework for game- and study design, we develop a card-based game for managerial group decision making, specifically for software engineering management teams. Our study is an industrial exploratory case study at the Swedish Transport Administration, where the decision-making game is tested on a management team. The aim of the study was to evaluate the perceived effects on the team’s engagement and overall decision-making process. Our experiments showed that the perceived engagement and confidence in making group decisions using the game was improved. Although difficult to conclude general remarks, the results give indications that the decision making process could benef it using the card game.