Serious gaming is an emerging approach to conflict resolution. Serious games provide a structured environment in which learning, research, and joint fact finding occur. Several serious games focus on water and groundwater. The Unitization Simulation Game, included here, provides a tool for mediators to show how collective governance of an aquifer can create win-win scenarios for players. This game includes resource management decisions, transresource effects, divergent interests, and collaboration components. These aspects of the game are intended to simulate how groundwater issues develop and how aquifer unitization could provide a solution.