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Mobile21 Co., Ltd. (モバイルニジュウイチ株式会社) was a Japanese video game developer that was a 50/50 joint venture between Nintendo and Konami established on October 7, 1999.[citation needed] Mobile21 primarily concentrated on next-generation Game Boy Advance development, with a particular interest in mobile phone linking features.[1]


On 1999-09-02, Nintendo Corporation and Konami Corporation announced the establishment of Mobile21 Co., Ltd., with the Mobile Adapter GB on sale in April 2000. [2][3]

The Mobile Adapter GB service began on January 27, 2000, and was terminated on December 14, 2002. However, the wireless feature was later found in Game Boy Advance Wireless Adapter.[citation needed]


Game Boy Color
Game Boy Advance


  1. ^ Tam, A. "Fun 'n Games in the New Economy", Japan – Business People Technology, J@pan Inc. October 2000. Accessed 22 March 2012
  2. ^ "任天堂とコナミの提携および合弁会社設立について". Archived from the original on March 22, 2007.
  3. ^ "任天堂とコナミの提携および合弁会社設立について". Archived from the original on September 30, 2007.

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