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Fans of Portal interested in similarly cerebral games should check out the following titles, which challenge players with first-person perspective puzzles, have plots related to mad science, and sometimes feature artificial intelligences running amok. Unlike most first-person shooters, in which players run around killing things with a gun, Portal and Portal 2 encouraged players to think their way past obstacles and question whether they should obey the mysterious voice directing them through the loudspeakers. Of all the first-person video games devised by Valve, the Portal franchise is arguably the most unique, blending fascinating, physics-based puzzles with a darkly humorous storyline of neurotic AI and mad science.