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It can be combined with walking exercise or driving. The idea is to capture assorted portals. Portals are historic points of interest. special land marks such as churches, libraries, parks, statues, artwork, etc. You also learn about points of interest in your community or your neighbors.
As an example see the battle between "enlightened" versus "resistance" in the Atlanta, Georgia, USA area as of 5 minutes ago.
Looks like the "enlightened" (green) are gaining ground here against the "resistance" (blue)