Diabolical is a completed TF/TG transformation text adventure game created by Cleo Kraft.
A text adventure game written in Tads 3 for the 2010 Halloween Contest on the TG/TF Transformation Games website.
The main character is Jake, off on vacation to a village beside a mountain lake. While there he discovers rumors about transformation machines, shrink rays and all kinds of fantastic things happening at the island in the middle of the lake. He gets dropped off by a hired boat ride and begins the game on the dock of the sandy shore.
The game has adult themes including sex change transformation and should only be played by adults.