Natural capital is of critical importance for biodiversity and people’s well-being. Studies indicate that understanding the connection between environmental health and human benefit (i.e., ecosystem services) can promote conservation-friendly decisions; however, many people don’t recognize the benefits they derive from nature, nor the way their decisions affect those benefits—and the consequences for our communities and economy. One method we have tested for educating people about ecosystem services and valuation is game-based learning. To help people understand their potential impact on ecosystem services, and how alternative decisions can have better or worse outcomes for people and nature, we created two social simulation games collectively called Tradeoff! Through an iterative design process and pilot testing in a number of locations with a variety of audiences, we have developed a set of learning principles for educational ecosystem service games.