Math Trail from HeyMath! is a series of map based math trivia challenges. Math Trail offers six thematic games. Each game follows a trail of locations that students have to find by using the clues provided. If they get stumped they can click "show location" but they lose the point value for the question. When they arrive at the correction location students have to answer the multiple choice math question presented to them before moving on to the next question in the trail.
Applications for Education
Math Trail provides a nice blend of geography questions and math questions appropriate for 5th to 7th grade students. You could create your a similar game yourself through Google Maps.