At the Boston Agile Game Conference Alex Boutin and myself attended the 'How to design your own game' workshop given Don McGreal (@donmcgreal) and Michael McCullough (@mccm68) of Tastycupcake.org fame.
The game is designed to let people experience the how to plan with stable teams and let them experience the advantages of planning with agile projects. It does this by giving a group a somewhat simplified portfolio wall and challenge them to optimize the value generated by the teams.
After they have made the perfect 3 year plan, we of course hit them with random events to mess up that plan.
The explanation of the game is up at tastycupcakes.org