Question: What South Korean global leader in online games for PC and mobile developed Crazy Arcade?

Context paragraphs:
Geewa: Geewa is a Czech online and mobile games company based in Prague.  It powers a portal for mobile multiplayer online games, Geewa.com.  The company develops and publishes casual competitive multiplayer games for mobile devices (phones, tablets) and browsers (such as Facebook games).  Geewa was awarded the Red Herring 100 Europe award in 2013.

NDOORS Corporation: NDOORS Corporation is a Korean gaming corporation and developer of online games and MMORPGs and is a subsidiary of one of the world's largest online gaming companies, Nexon.  Its headquarters are located in Seoul, South Korea.  NDOORS Corporation first started out as "Intizen co., Ltd" in September 1999, but later changed their name in October 2004 to "Ndoors Corporation."  On January 18, 2006, NDOORS Corporation took over Koong Entertainment which meant that NDOORS not only would be able to create PC Games, but PSP2 and PSP console games as well.  The current CEO of NDOORS Corporation is Cho, SeongWon.  The NDOORS logo can be simplified as "Distinction, Sympathy, and Expansion."

Nexon: Nexon (Hangul: 넥슨 ; RR: "Nekseun " ) Co., Ltd. is a South Korean global leader in online games for PC and mobile.  It services over 100 titles in over 190 countries.  Nexon was founded in Seoul, South Korea in 1994 by Kim Jung Ju and Jake Song.  In 2011, Nexon moved its headquarters from Seoul, South Korea to Tokyo, Japan.

Shutdown law: South Korea passed the Shutdown law (also called the Cinderella law; formally the Youth Protection Revision bill) on May 19, 2011.  It went into effect on November 20, 2011.  The Shutdown Law forbids children under the age of 16 in South Korea to play online video games from 12:00 A.M. to 6:00 A.M.  During the shutdown period, access to online games is to be blocked for all gamers aged under 16.  This law also caused problems that underage gamers started to steal KSSN (Korean Social Security Numbers) in order to elude the law.  However, consoles and mobile games are not affected.  Legal challenges to the law were filed by a group of Korean game manufacturers and by a cultural organization.  As of September 2, 2014, the law can be lifted per request of the children's parents.

NHN Entertainment: NHN Entertainment Corp.() is a South Korean developer, publisher and distributor of mobile and PC games founded in December 1999 under the name Hangame Communications, Inc.  NHN Entertainment is well known for its mobile game Fish Island, Fish Friends and Wooparoo Mountain and its online PC game EOS(Echo of Soul), ASTA, Football Day, Tera and Kritica.  More than 40 different online games including RPG games, casual web board games and sports games are available in its game portal, hangame.com (Hangame).  Currently, NHN Entertainment has more than 20 million total users and more than 0.3 million concurrent users.

Snail (company): Suzhou Snail Digital Technology Co., Ltd. (), doing business as Snail (), is a Chinese video game company and a Virtual Network Operator headquartered in Suzhou, China, which has branches Snail Games and Snail Mobile.  Its division, Snail USA, is responsible for bringing Snail Games products to audiences in North America and South America.  With a focus on free-to-play online games, Snail Games acts as a developer and publisher of original IP across multiple genres and distribution channels, including massively multiplayer online (MMOs), real-time strategy (RTS), and casual games.  Its global registered user base has reached over 70 million accounts, largely driven by its independent games portal Woniu.com.  The U.S. operation anticipates the launch of its portal for Western audiences in Q2 2011, PlaySnail.com, to further drive its efforts abroad.

Digital goods: Digital goods or e-goods are intangible goods that exist in digital form.  Examples include this Wikipedia article, webinars, video tutorials, digital media, such as e-books, downloadable music, internet radio, internet television and streaming media; fonts and graphics; digital subscriptions; online ads (as purchased by the advertiser); internet coupons; electronic tickets; online casino tokens; electronically traded financial instruments; downloadable software (Digital Distribution) and mobile apps; cloud-based applications and online games; virtual goods used within the virtual economies of online games and communities; workbooks; worksheets; membership programs; desktop backgrounds or wallpaper; planners; e-learning (online courses); interviews; blog posts; cards; labels; patterns; prints; clipart; stationery; gift tags; website themes; logos; photos; web graphics; templates.

Kongregate: Kongregate is a mobile and PC and Console publisher and web gaming portal.  The website features over 60,000 online games and 30+ mobile games available to the public.  Purchased by Gamestop Corporation in 2010, it has been acquired in 2017 by Modern Times Group MT AB.

Crazy Arcade: Crazy Arcade (Korean: 크레이지 아케이드) is a free Korean online multiplayer game developed by Nexon.  It has offered up to five different game modes throughout its history: Bomb and Bubbles (BnB), Tetris, Hidden Catch, Dizzy Pang, and Bz.  However, the latter four were eventually removed from the game.  BnB, which takes on the classic Bomberman series, adds its own twist to the game by replacing Bomberman's bombs with water balloons.  Crazy Arcade's success has spawned a franchise, having been followed by the release of the games "CrazyRacing KartRider", "CrazyShooting BubbleFighter", and "CrazyRacing AirRider".

Crazyracing Kartrider: Crazyracing Kartrider (Korean: 크레이지레이싱 카트라이더 ) is an online multiplayer racing game servicing at NEXON.  It is part of the "Crazy Arcade" franchise.  It earns revenues by selling virtual items in the in-game shop, including different types of vehicle and spraypaint.  KartRider not only features fictitious fantasy vehicles but also branded game models based on real-life cars, developed from collaboration with companies such as BMW Korea.  About 25% of South Koreans have played the game at least once.

Supporting paragraphs: Crazy Arcade Nexon
Answer: Nexon