Dragon Quest Heroes II's Multiplayer Will Allow For 4-Player Co-op - Siliconera

Dragon Quest Heroes II will allow for up to 4-player multiplayer co-op for story battles and exclusive dungeons. And yes, it'll have cross-platform play between PS4, PS3, and PS Vita.

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Dragon Quest Heroes II details multiplayer - Gematsu

Dragon Quest Heroes II Review

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Dragon Quest Heroes II - First Co-Op Gameplay - PS4/PS3/PS Vita