giving away a free copy of the new NES game Dragon Quest to every new subscriber. This promotion was in part a move on Nintendo's part to make money off Dragon Warrior (Dragon Quest in Japan). The game had not sold nearly as well as Nintendo had anticipated, leaving the company with a large number of unsold cartridges. The promotion both helped the company get rid of the unsold merchandise, and won the magazine thousands of new subscribers. Following the release of the Super NES, the magazine featured lengthy, continuous comic stories based on Super Mario World and The Legend of Zelda: A Link to the Past. After these stories ended, they were replaced by similar multi-issue stories based on Star Fox, Super Metroid, and later, Nintendo 64 games such as Star Wars: Shadows of the Empire and Blast Corps. It had several comics based on the animated series of Pokémon and Kirby: Right Back at Ya!. Toward the end, it included short excerpts based on Custom Robo and Metal Gear Solid: The Twin Snakes. It included a very short Metroid Prime comic, and another story based on the Pokémon Mystery Dungeon games translated from the original Japanese version. Official Guides from Nintendo Power Nintendo Power produced a series of strategy magazines called Official Guides from Nintendo Power, beginning with The Official Nintendo Player's Guide. After Nintendo Power switched from a bi-monthly magazine to a monthly magazine in May 1990, some issues were positioned as strategy guides for single games replacing the guides. However, only four such issues were produced before Nintendo outsourced production of official guides to Prima Games. Nintendo Power Line The Nintendo Power Line was a staffed hotline providing gameplay hints about Nintendo consoles, such as the Nintendo Entertainment System. It ran from the publishing of the first issue publication of Nintendo Power in 1988 until June 2010, closing in favor of the Internet. The hotline was revived as automated messages, from November 11 to November 13, 2016, in celebration of the release of the NES Classic Edition. Spin-off magazines During 2001, Nintendo Power released a spin-off semi-magazine named Nintendo Power Advance, featuring the Game Boy Advance and its games. The first issue was complimentary for subscribers, and sold at newsstands. Four issues of Nintendo Power Advance were printed, the last of which is a strategy guide for Super Mario World: Super Mario Advance 2. With the