Video games have evolved dramatically since the 60s and 70s when the likes of Spacewar! and Atari laid the foundation of what would become a multi-billion dollar industry. That evolution has seen trends come and go, from an emphasis on platformers in the 80s and 90s to the cover-based shooters of the 2000s. But there have been smaller changes too, as developers play around with minor game mechanic tweaks. Objective markers have had a particularly interesting past, and their evolution won't end any time soon.