Ys vs. Sora no Kiseki: Alternative Saga

Also known as:  Ys vs Sora no Kiseki PSP

Ys vs. Sora no Kiseki: Alternative Saga is a crossover multiplayer fighting game for the PSP, in which characters from Nihon Falcom's two most successful franchises - Ys and The Legend of Heroes: Sora no Kiseki - meet face to face in battle. A co-op multiplayer mode is also included, and on the technical side, Ys vs Sora no Kiseki is based on the same company's Ys Seven engine, featuring a free-roaming 3D world map.

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Producers, official website and other details: Wiki