Arrow Dynamics created an alternate version of the concept, but it never made it past the prototype stage in development.

Intamin developed a version known as the Spiral Coaster model, building only one installation, which is no longer in operation.

Between the second and third rolls is a switch track that tilts trains to an approximately 45 degree angle, sending them through the remainder of the course backwards.

The Ultratwister at Rusutsu Resort is the only S-II model built by TOGO, featuring a dive loop instead of a switch track.

This was later scrapped in favor of Nemesis after Wardley rode the prototype and disliked the experience it offered.