Your hero in Gun Master must prove his title as a Gun Master. Every professional in his field must periodically show that his skills have not gone away and his skill has not disappeared. The shooter's victory depends entirely on your reaction. He only has one shot to move up the stairs. As you climb the stairs and stop on the landing, you will see the target. Your shooter will move the weapon, and you will stop it as soon as the sight is aimed at the opponent. That's when you can pull the trigger. If you miss, your opponent will get a chance, and he certainly won’t miss in Gun Master.
