Battle Tag barely qualifies as a video game - it seems to have more in common with old "multimedia" board games like Nightmare - but hey, Ubisoft is releasing it, so here you go.
It's essentially Laser Tag, with four guns and sensor packs used by players running around the real world shooting each other. The "video game" part comes in that your console is used to track scores and issue assignments, as the game also includes small sensors that can be placed outside as "objectives", and these will relay back to another sensor that can help your console stay on top of things.
So strange. It's due towards the end of the year, but no word on platforms or price.