Proto:Worms (DOS)

This page details one or more prototype versions of Worms (DOS).

Ninja Rope

The README.TXT file included with the demo contains the following text:

This demo is limited to 2 teams of worms, 2 landscapes out of 
4.3 Billion, 10 minutes of matchtime over 1 round with 60 seconds
per worm. The Sheep, Bungee, Batrope, Banana Bombs and Crates 
are missing from the demo. For a full list of the finished games
features, see the end of this document.

This indicates that the Ninja Rope was originally called the Batrope, and then likely dropped for copyright reasons. (In the playable demo itself, it's already called the Ninja Rope.)