Modal using Adobe Target

Hi everyone,

The requirement I have is to show a modal or a popup using Adobe Target. The requirement seems simple, but we are having difficulties in implementing it. 

The page which we are targetting is a games page, where all games load on a flash player. We are targetting the anonymous users here. My question is how could we possibly trigger the modal on this page? The game loads on a flash player, and there is no way to capture the game end event. After the game ends there is no page load or redirect or any other event. So how could we possibly capture the event and if we can, could we be able to implement the popup using Target?