Shadow Warriors is a European Game Boy release. Its genre and exact mechanics are unknown without further information. The title suggests a likely action-adventure game with a focus on stealth, combat, or a combination thereof.  The specific storyline and game design choices would need to be researched through gaming historical records to understand its place in the Game Boy catalog.  The developer and release year are currently missing.

Shadow Warriors (Europe)

Sengoku Ninja-kun (Japan)