Widest aspect ratio for an arcade machine

According to Official Guinness Records,

With an aspect ratio of 32:9 (double the width of a standard widescreen TV), DariusBurst Another Chronicle has the widest panoramic display of any arcade game. The side-scrolling shooter was location tested in Akihabara, Tokyo, Japan, in August 2010 ahead of its nationwide roll-out.
Featured in Guinness World Records Gamers Edition 2011

For a complete list of 2010 records, please visit 2010 Guinness Records in Japan.

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