Tenchu 2 was my introduction into the series and remains my favorite of all the sequels. The graphics, audio and bone slicing, steel on steel sound effects created an authentic feudal Japan atmosphere that still holds up even today. From what I can recall there was no other stealth ninja game available on the PS1 beside the Tenchu series. The first title even predated the legendary Metal Gear Solid!
The ability to play through the campaign with 3 different protagonists kept things fresh with day/night changes to locations and different bosses which made each play-through unique and was pretty impressive at the time. It was a challenging game especially when it came to boss fights as your ninja was not well suited for one on one duels but instead excelled in attacking from the shadows with a variety of tools. It would be great if the port could make use of save states as having to replay an entire level if you failed at a boss may require some long lost patience that doesn't exist anymore.
In addition to the awesome campaign was the level editor where I spent many hours creating my own level scenarios. It would be interesting to see how sharing created levels could be done with a GOG port. I look forward to rejoin Rikimaru, Ayame and Tatsumaru on their journey to relive some memories of old via an modern day accessible GOG port.