Example images of a captured and uncaptured flag in Phoenix USC. Control of the flag means ultimate victory.
I am designing the Alien Phoenix framework to use switches, which when crossed can be used activate map objects. In addition to the flag all ramps leading to the upper level of game play use entry and exit switches. It works very well and opens up lots of map design options.
Edit: That caption (red flag) should read “uncaptured”… Oops.