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Lullaby (子守歌を歌う,Komori utawoutau?) is a technique that appears in Sonic Shuffle. It is the Special Attack Ability of the Chao.
Lullaby can only be used during battles, and will be initiated when using a Special card. The player must then promptly designate a battle card. Just as with a normal attack, a roulette will then spin within the parameters of the battle card number. If the Chao does not defeat the opponent after the roulette, the opponent will not attack it, having been put to "sleep" by it singing.