Hong Kong distributor Game Source Entertainment recently quickly published and removed pages dedicated to Ninja Gaiden Sigma Trilogy for PlayStation 4 and Nintendo Switch.
The product page mentioned a release of Ninja Gaiden Sigma Trilogy in March 2021 before being removed. This is all the information we can share right now, but if it is leaked again or the collection is officially announced, we will be sure to update you.
According to the description, the collection includes Ninja Gaiden Sigma, Ninja Gaiden Sigma 2 and Ninja Gaiden 3: Razor’s Edge. A price of $39.99 and a previously anticipated release window set for March 2021 are also mentioned.
For clarity, this collection would not include Ninja Gaiden Black, what is widely considered the best version of the original game. Since the page is no longer available for viewing, it probably means that this collection is absolutely true but it appeared earlier than expected or was just something fake.
To find out if Koei Tecmo is really working on a similar collection we will have to wait for an official announcement.