___Guessr, hit online game whose players deduce locations from Google Street View images

GEO

Think of the Greek word for "earth," often used as a prefix in geography-related terms. This game’s name combines that prefix with a word meaning to estimate or figure out.

This clue refers to GeoGuessr, the popular online game where players drop into random Google Street View locations and guess where they are. The blank in the clue hints at the first part of the name, "Geo," which is short for "geography." Since the answer is just three letters, it’s a truncated version of the full game title, focusing on the key prefix.