Become a Dungeon Killer from the Point of Being Unable to Pass the Tutorial Level

Can superpowers be awakened by playing games? In the year 347 of the Virtual Era, a virtual reality game called "The Other Side" became popular all over the world as soon as it was launched. Player Ran Xuan unfortunately won the YEE tag teaching level carefully designed by the game development team. After "falling asleep" N times, I finally cleared the level and obtained the easter egg equipment [Justice·Death Revolver]. Special effect: Kill with one hit. However, there is a password lock for shooting, and the password for each game is randomly generated, and the password can be obtained by solving problems. Ran Xuan spent his whole life learning, "Go and Diudiu", threw Leibniz, Taylor, Gauss, Euler and Fourier, and finally found the correct answer! Turn the magazine, four on the left, three on the right, nine on the left, six on the right! Feel the anger of the question maker! Pull the trigger and kill with one hit! Smoke rose, bullet casings fell, but nothing happened... Miss? How is that possible? ! Aim for the head, aim for the head to kill with one hit! I'm super! From then on, the Headless Horseman became Ran Xuan's lifelong nightmare...