66%Strong matchThe Messenger
93%10k93% positive reviews, Very Positive across 10k reviews·Retro · Platformer
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Old Ninja: Underworld is a 2D pixel-art Metroidvania action game where an aging ninja explores a chaotic underground world. Battle through a bizarre mix of enemies with no apparent connection, strengthen your ninja, and challenge the boss lurking deep below.
Old Ninja : UnderWorld
SteamOld Ninja: Underworld – Overview
🔍 Exploration
The underground world is a labyrinth, much like an ant nest. Some paths may be inaccessible at first. In such cases, explore thoroughly and search for upgrade items. These items will guide the ninja to new areas.

⚔️ Combat
The ninja wields not only swords and shurikens, but also a variety of attack techniques. Use them wisely to challenge formidable enemies.

📈 Upgrades
Defeating monsters in the underground world grants experience points. Leveling up enhances your abilities. Power up and cut through the hordes of monsters.

👹 Monsters
Various monsters roam the underground world, seemingly originating from different realms. Defeat the final boss lurking deep within this chaotic domain.
🔥 Fast Travel
Campfires are scattered throughout the world. You can fast travel between them to explore the underground world more comfortably.

📖 Story
This game has no story—none at all. It’s purely focused on exploration, combat, and upgrades. That’s what it does, and it does it well.
Note: Xbox controllers are supported, but some actions—such as settings and fast travel—may require mouse input. Thank you for your understanding.
Note: Key configuration is available, but please note that some display elements may not appear correctly. We appreciate your understanding.
Note: To ensure a comfortable experience with the full version, we recommend trying the demo first. Please check the system compatibility and gameplay feel before making your purchase.
Streaming Guidelines
As long as these conditions are met, you are free to stream or create videos using this game. Monetization is allowed.
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Estimated completion time: 1h~2h
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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