Play One Piece: Grand Battle Swan Colloseum emulator game online in the highest quality available. One Piece: Grand Battle Swan Colloseum is a WonderSwan game that you can enjoy on Play Emulator. This WonderSwan game is the US English version that works in all modern web browsers without downloading. One Piece: Grand Battle Swan Colloseum is part of the Fighting Games, Action Games, and Anime Games you can play here. PlayEmulator has many online retro games available including related games like Fire Emblem: The Sacred Stones, Harry Potter and the Sorcerer’s Stone, and Legend of Zelda: Ancient Stone Tablets.