Sinjid is a series of role-playing strategy-based action-adventure flash games created by Krin. It revolves around the eponymous character "Sinjid", who is a shinobi (ninja).
There are three games in the Sinjid series up to now: "Sinjid Battle Arena", "Sinjid Shadow of the Warrior" and "Sinjid". Although all titles in the series are not much canon with each other, each of them have some elements in common with each other, like the main character, which is Sinjid himself, a battle system with equipment, skill system, level system, equipment upgrades, and more.
The series as a whole carries a past Japan theme, and in the case of "Sinjid", it explicitly references Japan as the setting. For this reason, melee weapons such as swords are the primary weapons. However, the setting is also different and more advanced in some other ways compared to early Japan, as magical abilities are a prevalent element of the series.