Without more context, "Ntsd" could stand for or relate to something else entirely.

: You can download the NTSD 2.6 archive (approx. 48.56 MB) directly from the NTSD ModDB downloads page .

Before you can download anything, it's vital to know what you're looking for. The acronym "NTSD" stands for two very different things:

A side-scrolling beat-'em-up campaign where players fight through waves of rogue ninja and powerful bosses, following loose adaptations of the anime's story arcs.

As with any abandonware or fan mod, always run a virus scan on the downloaded folder before opening it. Because these games are built on old engines, some antivirus programs might flag them as "False Positives" due to the way they hook into your keyboard inputs. Stick to community-vetted links to stay safe.