The document describes Cyberdam, an online virtual city simulation developed to enable teachers to create their own educational simulations. Students take on roles in the virtual city, such as shopkeeper or lawyer, and complete tasks over the course of a simulated game session that can last a week or more. The simulation has been applied in various educational projects involving over 15 institutions. An updated version, Cyberdam 2, aims to improve the software and develop new pre-made simulation games while establishing an organization to maintain the system long-term.