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If you want to talk about super long tail games, look at The Legend of Heroes: Trails in the Sky. The PSP version was released in Japan on October 28, 2006 and the initial shipment was a mere 18,000 units.
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Fast forward to seven years in the future and The Legend of Heroes: Trails in the Sky FC racked up more than 500,000 units sold. Not sure if international sales are part of this figure since Xseed and Ghostlight published Trails overseas.
The Legend of Heroes: Trails in the Sky SC will be released next year in English on PSP and PC care of Xseed.
