Tap the yellow question mark at the bottom corner of your Google Maps screen, and you're in for a surprise.
Google's celebrating Mario Day this week by inviting Nintendo's iconic character into its Maps. Update the app, look for the question mark, then you can enable "Mario Time." Start Navigation (step-by-step driving directions) within Maps, and the traditional blue arrow showing your progress will be replaced by the irrepressible plumber driving his little kart.
Mario day is Saturday, March 10 (Mar10, see?). Google Maps is rolling out the Easter Egg on Friday and it will be live for a week.
Google's announcement encourages you to use the integration safely, and not "throw bananas or red shells at other drivers in real life."