ARG (Alternate Reality Game) is a popular form of entertainment where players solve puzzles and complete challenges to progress through a fictional storyline. If you're looking for synonyms for the word "ARG," you might want to consider related terms like "immersive game" or "interactive fiction." These descriptions capture the same idea of an engaging and interactive experience that blurs the lines between reality and fantasy. Other synonyms for ARG might include "augmented reality game" or "transmedia experience," which speak to the technology and storytelling techniques often used in these games. Ultimately, no matter what you call it, an ARG is an exciting and imaginative form of entertainment that can delight and challenge players in a variety of ways.