The online video trick challenges viewers to glimpse the mystery marksman hiding in plain sight in time before he pulls the trigger.
The TikTok clip throws down the gauntlet for quick reactions, telling people taking part: “Spot the sniper – you have 10 seconds.”
Some have succeeded in finding him but others fell short, running out of time before the gunman rises to his feet and prepares to fire.
Comments below the footage include “Got him” and “easy”.
But others admitted “I was wrong” and “Well, I would be dead”.
Similar exercises lately have urged people to discover whether they can peek another sniper, this time in a nature scene – while others feature a cat among dogs and a predatory lion.
Other posers star a shore-bound shark, a hive’s Queen bee and a woodland wolf.
There have also been tests to determine the number of circles in an optical illusion, where a snake is hiding or else a dog in a kitchen.
A five-second challenge is to spot a hidden gecko – while a concealed turtle test allows up to 15 seconds.
Another picture challenge was said to be a personality test about whether you’re reliable or anxious based on what you first see.
Similar debates have covered being an over-thinker or easy-going, a compromiser or leader or else a cynic or innocent.