YU-GI-OH! GX Quiz by Shmuel RossThis quiz is based on the start of the first season of the American version of the cartoon series. Try the YU-GI-OH! TV Series quiz. Question 1 (out of 10): What does the "GX" in "Yu-Gi-Oh! GX" stand for? Gaming eXtreme Game eXpert Generation neXt Grilled Xtracheese FEN Learning is part of Sandbox Networks, a digital learning company that operates education services and products for the 21st century.