Harry Potter and the Chamber of Secrets is the second novel in the Harry Potter series, written by J. K. Rowling. The plot follows Harry's second year at Hogwarts School of Witchcraft and Wizardry, during which a series of messages on the walls of the school's corridors warn that the "Chamber of Secrets" has been opened and that the "heir of Slytherin" would kill all pupils who do not come from all-magical families. These threats are followed by attacks which leave residents of the school "petrified" (frozen like stone). Throughout the year, Harry and his friends Ron Weasley and Hermione Granger investigate the attacks. The book was published in the United Kingdom on 2 July 1998 by Bloomsbury and in the United States on 2 June 1999 by Scholastic Inc. Although Rowling found it difficult to finish the book, it won high praise and awards from critics, young readers and the book industry, although some critics thought the story was perhaps too frightening for younger children. Much like with other novels in the series, Harry Potter and the Chamber of Secrets triggered religious debates; some religious authorities have condemned its use of magical themes, while others have praised its emphasis on self-sacrifice and on the way in which a person's character is the result of the person's choices. Several commentators have noted that personal identity is a strong theme in the book, and that it addresses issues of racism through the treatment of non-magical, non-human and non-living characters. Some commentators regard the diary as a warning against uncritical acceptance of information from sources whose motives and reliability cannot be checked. Institutional authority is portrayed as self-serving and incompetent. The book is also known to have some connections to the sixth novel of the series, Harry Potter and the Half-Blood Prince. The film adaptation of the novel, released in 2002, became the third film to exceed £600 million in international box office sales and received generally favourable reviews. Video games loosely based on Harry Potter and the Chamber of Secrets were also released for several platforms, and most obtained favourable reviews.

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Harry Potter and the Prisoner of Azkaban is the third novel in the Harry Potter series, written by J. K. Rowling. The book follows Harry, a young wizard, in his third year at Hogwarts School of Witchcraft and Wizardry. Along with friends Ron Weasley and Hermione Granger, Harry investigates Sirius Black, an escaped prisoner from Azkaban whom they believe is one of Lord Voldemort's old allies. The book was published in the United Kingdom on 8 July 1999 by Bloomsbury and in the United States on 8 September 1999 by Scholastic Inc. Rowling found the book easy to write, finishing it just a year after she had begun writing it. The book sold 68,000 copies in just three days after its release in the United Kingdom, and since has sold over three million in the country. The book won the 1999 Whitbread Children's Book Award, the Bram Stoker Award, the 2000 Locus Award for Best Fantasy Novel, and was short-listed for other awards, including the Hugo. The film adaptation of the novel was released in 2004, grossing more than $796 million and earned noble critical acclaim. Video games loosely based on Harry Potter and the Prisoner of Azkaban were also released for several platforms, and most obtained favourable reviews.

International Karate is a karate fighting game created and published by System 3 for various home computers. Of these versions the 1986 releases for Commodore 64 and Atari 8-bit computers, created by Archer MacLean with music by Rob Hubbard, stand out for their good playability and overall high production values. Although conceptually identical, the ZX Spectrum version, created by a different team and released some months earlier in November 1985, is inferior. Epyx licensed and published the game in the US as World Karate Championship in April 1986. Except for a new loading screen and necessary tuning for the American NTSC television system, the US releases were unchanged. International Karate + a successor which expanded the gameplay through the introduction of an additional - although not player controllable - karateka, was released in 1987. Through the unauthorized release of International Karate + Gold in 2001, this player was made controllable using a joystick adapter.