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Beach Festival World Championship ; Big Twin; Block Gal; Boong-Ga Boong-Ga; Bubble (or Hot Bubble); Cannon Ball; Canvas Croquis; Dancing Eyes; Disco Boy; Double Point. The following is a list of video games that have been given the "Adults Only" (AO) rating by the Entertainment Software Rating Board (ESRB), a United States-based organization which rates the content of video games to determine its appropriateness for specific age groups. Although it is not legally binding under U.S. law, the ESRB rating system is a de facto standard which is self-enforced by.