The 128k version of Ninja Princess, an arcade game likely featuring a female ninja protagonist, expands on the 64k version with improved graphics, sound, and potentially more gameplay content such as more levels or enemies. The 315-5051 code suggests a model number, which would require more information to understand fully.  The game history and developer remain unclear, needing further research.

Ninja Princess (315-5051?, 128k Ver. version?)

Ninja Kazan (World)