Question: On what day did the publisher of The New Tetris unveil the new systems?

full_context: Document 1: Nintendo Entertainment System: At June 1985's Consumer Electronics Show (CES), Nintendo unveiled the American version of its Famicom. This is the system which would eventually be officially deployed as the Nintendo Entertainment System, or the colloquial "NES". Nintendo seeded these first systems to limited American test markets starting in New York City on October 18, 1985, following up with a full-fledged North American release of the console in February of the following year. Nintendo released 17 launch titles: 10-Yard Fight, Baseball, Clu Clu Land, Duck Hunt, Excitebike, Golf, Gyromite, Hogan’s Alley, Ice Climber, Kung Fu, Pinball, Soccer, Stack-Up, Tennis, Wild Gunman, Wrecking Crew, and Super Mario Bros.h[›] Some varieties of these launch games contained Famicom chips with an adapter inside the cartridge so they would play on North American consoles, which is why the title screen of Gyromite has the Famicom title "Robot Gyro" and the title screen of Stack-Up has the Famicom title "Robot Block".
Document 2: Tetrisphere: Tetrisphere is a falling block puzzle video game for the Nintendo 64 (N64) console. Developed by Canadian company H2O Entertainment, a nearly complete version of the game was originally slated for release on the Atari Jaguar in early 1995. After Nintendo obtained its publishing rights, "Tetrisphere" was reworked for the N64 and released on the platform in North America on August 11, 1997, and the PAL regions in February 1998.
Document 3: List of Super Nintendo Entertainment System games: Of the console's 783 official releases, 249 were exclusive to North America and 62 to Europe. The Super NES was released in North America on August 23, 1991 with its launch titles being Super Mario World, F - Zero, Pilotwings, SimCity, and Gradius III. The last game to be officially published for the system was Frogger in 1998. The best - selling game is Super Mario World with over 20.6 million units sold. Despite the console's relatively late start, and the fierce competition it faced in North America and Europe from Sega's Genesis / Mega Drive console, it was the best - selling console of its era.
Document 4: Nintendo Entertainment System: For its complete North American release, the Nintendo Entertainment System was progressively released over the ensuing years in four different bundles: the Deluxe Set, the Control Deck, the Action Set and the Power Set. The Deluxe Set, retailing at US$199.99 (equivalent to $475 in 2016), included R.O.B., a light gun called the NES Zapper, two controllers, and two Game Paks: Gyromite, and Duck Hunt. The Basic Set, retailing at US$89.99 with no game, and US$99.99 bundled with "Super Mario Bros." The Action Set, retailing in 1988 for US$149.99, came with the Control Deck, two game controllers, an NES Zapper, and a dual Game Pak containing both Super Mario Bros. and Duck Hunt. In 1989, the Power Set included the console, two game controllers, a NES Zapper, a Power Pad, and a triple Game Pak containing Super Mario Bros, Duck Hunt, and World Class Track Meet. In 1990, a Sports Set bundle was released, including the console, an NES Satellite infrared wireless multitap adapter, four game controllers, and a dual Game Pak containing Super Spike V'Ball and Nintendo World Cup. Two more bundle packages were later released using the original model NES console. The Challenge Set of 1992 included the console, two controllers, and a Super Mario Bros. 3 Game Pak for a retail price of US$89.99. The Basic Set, first released in 1987, was repackaged for a retail US$89.99. It included only the console and two controllers, and no longer was bundled with a cartridge. Instead, it contained a book called the Official Nintendo Player's Guide, which contained detailed information for every NES game made up to that point.
Document 5: Nintendo Entertainment System: In the UK, Italy and Australia which share the PAL A region, two versions of the NES were released; the "Mattel Version" and "NES Version". When the NES was first released in those countries, it was distributed by Mattel and Nintendo decided to use a lockout chip specific to those countries, different from the chip used in other European countries. When Nintendo took over European distribution in 1990, they produced consoles that were then labelled "NES Version"; therefore, the only differences between the two are the text on the front flap and texture on the top/bottom of the casing.
Document 6: Nintendo Entertainment System: As the 1990s dawned, gamers predicted that competition from technologically superior systems such as the 16-bit Sega Mega Drive/Genesis would mean the immediate end of the NES’s dominance. Instead, during the first year of Nintendo's successor console the Super Famicom (named Super Nintendo Entertainment System outside Japan), the Famicom remained the second highest-selling video game console in Japan, outselling the newer and more powerful NEC PC Engine and Sega Mega Drive by a wide margin. The console remained popular in Japan and North America until late 1993, when the demand for new NES software abruptly plummeted. The final Famicom game released in Japan is Takahashi Meijin no Bōken Jima IV (Adventure Island IV), while in North America, Wario's Woods is the final licensed game. In the wake of ever decreasing sales and the lack of new software titles, Nintendo of America officially discontinued the NES by 1995. However, Nintendo kept producing new Famicom units in Japan until September 25, 2003, and continued to repair Famicom consoles until October 31, 2007, attributing the discontinuation of support to insufficient supplies of parts.
Document 7: 3D Tetris: 3D Tetris is a puzzle video game developed by Technology and Entertainment Software and published by Nintendo. It was initially released for the Virtual Boy on March 22, 1996, in North America only. The game allows players to control multiple falling blocks, rotating and positioning them to clear layers in a "Well". The game is similar to other Tetris games, but uses a three-dimensional playing field as opposed to the traditional two-dimensional view. The game contains multiple modes and gametypes, as well as different difficulty settings and levels, which change different aspects of the gameplay.
Document 8: Nintendo Entertainment System: The Nintendo Entertainment System (commonly abbreviated as NES) is an 8 - bit home video game console that was developed and manufactured by Nintendo. It was initially released in Japan as the Family Computer (Japanese: ファミリーコンピュータ, Hepburn: Famirī Konpyūta) (also known by the portmanteau abbreviation Famicom (ファミコン, Famikon) and abbreviated as FC) on July 15, 1983, and was later released in North America during 1985, in Europe during 1986 and 1987, and Australia in 1987. In South Korea, it was known as the Hyundai Comboy (현대컴보이 Hyeondae Keomboi) and was distributed by SK Hynix which then was known as Hyundai Electronics. The best - selling gaming console of its time, the NES helped revitalize the US video game industry following the video game crash of 1983. With the NES, Nintendo introduced a now - standard business model of licensing third - party developers, authorizing them to produce and distribute titles for Nintendo's platform. It was succeeded by the Super Nintendo Entertainment System.
Document 9: Pokémon Puzzle League: Pokémon Puzzle League is a puzzle game for the Nintendo 64 console. It is based on Nintendo's "Puzzle League" puzzle games, with Pokémon likenesses. It was released in North America starting in 2000, and in Europe. It is one of several "Pokémon" games to be based on the "Pokémon" anime, and features Ash Ketchum and other characters featured from the anime. The game was released on the Virtual Console on May 5, 2008, in the North America region, and on May 30, 2008, in the European region.
Document 10: New Puzzle Bobble: , also known as New Bust-a-Move, is a tile-matching puzzle video game developed by Moss and published by Taito for iOS. The game was released worldwide on February 4, 2011, and features integration with Game Center.
Document 11: Nemrem: Nemrem, known as Zengage in North America and Somnium in Japan, is a puzzle video game developed by Skip Ltd. and published by Nintendo for the Nintendo DSi's DSiWare digital distribution service.
Document 12: Nintendo Entertainment System: Video output connections varied from one model of the console to the next. The original HVC-001 model of the Family Computer featured only radio frequency (RF) modulator output. When the console was released in North America and Europe, support for composite video through RCA connectors was added in addition to the RF modulator. The HVC-101 model of the Famicom dropped the RF modulator entirely and adopted composite video output via a proprietary 12-pin "multi-out" connector first introduced for the Super Famicom/Super Nintendo Entertainment System. Conversely, the North American re-released NES-101 model most closely resembled the original HVC-001 model Famicom, in that it featured RF modulator output only. Finally, the PlayChoice-10 utilized an inverted RGB video output.
Document 13: Hybrid Heaven: Hybrid Heaven is a video game developed by Konami Computer Entertainment Osaka and released for the Nintendo 64 in 1999. This game is most notable for its peculiar mix of genres: it has aspects of both role-playing video games and action-adventure games. The designers had hoped to create a "new style RPG battle system". It is also one of the few Nintendo 64 titles to support a widescreen mode.
Document 14: The New Tetris: The New Tetris is a puzzle video game for the Nintendo 64. The game was developed by H2O Entertainment and published by Nintendo, based on the latter's popular "Tetris" series. The game was originally released on July 31, 1999, in North America.
Document 15: List of best-selling video games: This is a list of the best - selling video games of all time. The best - selling video game to date is Tetris, a tile - matching puzzle video game originally released for the Electronika 60 in 1984 and then popularised upon its Game Boy release in 1989. The game has been ported to a wide range of platforms and sold in excess of 170 million units, including 100 million paid downloads on mobile phones and 35 million as sales for the Game Boy version. Minecraft is the only other video game to have sold over 100 million units, with 122 million units sold as of February 2017. Excluding mobile sales, the best - selling video game of all time is Wii Sports with 82.83 million units sold, while Tetris is the fourth best - selling with sales of 70 million units.
ground_truth: October 18, 1985
sub_queries: What is the publisher of The New Tetris? Answer: Nintendo
What day did Nintendo unveil the new systems? Answer: October 18, 1985