In the 80s and 90s, Japanese publishing company Futabasha released a series of gamebook adaptations of various video games. Part of their "Famicom Game Book Series" was January of 1987's "Metroid: Zebes Invasion Order", written by Nobuyuki Shioda and illustrated by Arisaka Sumi. The game book is a retelling of the original Metroid video game, with an extra adventure taking place as part of an expanded ending sequence. Twinetroid is a conversion of this gamebook into interactive fiction game engine Twine. The game is freely available online at Metroid fansite Metroid Database.