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About 9th Sentinel Sisters
9th Sentinel Sisters is a side-view twin-stick action game with roguelite elements, set in a near-future world overrun by aliens. You fight to reclaim the surface, using weapons and reinforcement parts to defeat waves of approaching creatures.
Story
An unknown meteorite lay dormant deep beneath the Earth until, after 10,000 years, it changed. The meteorite was an alien life-form's egg, and the countless alien “breeds” born from it rapidly devoured the planet. The land was devastated, national governments ceased to function and humanity was defeated, forcing survivors to take refuge in sturdy underground shelters called Arks.
Humanity developed two anti-bleed combat weapons from its knowledge and resources: the manned weapon Father and combat clone soldiers with the appearance of girls, who pilot it. They live at a deserted frontline base before setting out to fight.
Build your strategy
Choose a hero and assemble a build from 16 types of weapons and 37 types of reinforcement parts. Lasers, drills and missiles are among the powerful weapons you can use to wipe out large numbers of approaching aliens. For each stage, assess the situation and choose whether to pursue strong enemies, strengthen your weapons or recover damage as you work toward clearing the game. Stage missions are simple, letting you focus on the action in short sessions.
Heroes and combat
The game features six heroes and lets you try different strategies with each. Its side-view twin-stick combat pits you against aliens in a post-apocalyptic world.
Frequently asked questions
The best price for 9th Sentinel Sisters is $7.99 at Steam. It is the only shop with an offer that activates in your country.
The minimum requirements for 9th Sentinel Sisters are: Windows 10, Radeon R7 260X, AMD A8-7600, 4 GB RAM, 1 GB storage. It runs on Windows only. The recommended specs are in the System requirements section.
No. 9th Sentinel Sisters is a single-player game.
Yes. Valve rates 9th Sentinel Sisters as Verified on the Steam Deck: it runs well out of the box.
Yes. 9th Sentinel Sisters is the full base game. You need nothing else to play it.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.











