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In celebration of the recent release of 'Kingdom Hearts HD 1.5 + 2.5 ReMix' in Japan, Square-Enix has launched a website celebrating the series' music. In the website, you could watch Sora running on sheet music while listening to one of eight tracks, which include:

• Sora
• Riku
• Kairi
• Roxas
• Aqua
• The 13th Struggle
• Blast Away! Gummi Ship I
• Tension Rising

Depending on the chosen track, Sora's running, as well as background images and dialogue will change. In addition to the website, there will be a campaign that'll go on until March 31st, with the winner winning a DEARLY BELOVED music box:

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The campaign for now appears to be only for Japanese fans, as it involves tweeting your favorite KH memory involving the story or music to the official Kingdom Hearts Japanese twitter account. However, for those of you still wanting to give it a try, make sure you tweet with the following hashtag: #音で視るキングダムハーツ

Source: KHInsider