Hit markers are visual cues in first-person shooters that indicate the impact of a shot, often accompanied by an 'X'. Before 2007, developers used impact animations and effects like blood spurts for feedback instead of UI elements. Notable franchises like Halo and Gears of War initially provided immersive feedback through visual cues but have since adopted hit markers, which clutter the HUD and diminish the immersive experience. The trend raises questions about balancing clarity and immersion in game design, as seen in contrasting examples like Left 4 Dead 2, which uses dynamic enemy reactions, versus Back 4 Blood, which employs hit markers.