The Book of Thunder (ブック・オブ・サンダー Bukku obu Sandā?) is an item appearing exclusively in the Nintendo Entertainment System and Famicom Disk System version of Bubble Bobble. It is a book of magic that allows the player to breathe Thunder Bubbles, behaving identically to the effects of a Drug of Thunder, though it spawns during regular gameplay instead of only appearing during the game's final boss fight.