Fortress Saga: Idle AFK RPG

Name: Fortress Saga: Idle AFK RPG
Author: CookApps

2.1.20

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4.401M+ installs

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Epic Idle RPG Fortress War! Defend the castle, upgrade hero & battle for victory

Fortress Saga: Idle AFK RPG for castle and hero builders

By Mei-Lin Chua

Contributing editor, apps and storefronts

Moving fortress upgrades and a castle layout you build
Hero units summoned and strengthened with strategic skills
Auto-battle that keeps running while you are offline or asleep
Dark dungeon vaults to explore and fight through
Collectible units and a path from recruit to hero

What Fortress Saga is and who it suits

Fortress Saga is a role playing game built around idle play. You manage a fortress, a group of hero units and a castle layout, and the game keeps progressing when you are not actively playing. The developer lists it under Role Playing and rates it PEGI 16.

It suits people who like idle and AFK games with a strategy layer. The listing points to its appeal for players who enjoy deep strategy, combat mechanics and collecting units. The story follows two characters, Cor and Louis.

Upgrading the fortress and building the castle

The fortress is the central piece. You upgrade it as it moves through the game, and you also arrange the castle layout yourself. The listing describes this as building toward a complete castle.

Upgrades are the main way the fortress gets stronger, so the layout and the fortress grow together over time.

Summoning heroes and strategic skills

You summon hero units to fight for you. The listing says each hero can be developed with strategic skills, so the choice of skills affects how a hero performs in battle.

The listing also describes a progression where a basic recruit grows into a full hero through levelling up. Levelling is presented as automatic rather than something you grind for.

Auto-battle and idle progress while offline

Auto-battle runs the fights for you. The developer says the hero, the fortress and your rewards keep growing while the phone is off, you are offline or you are asleep.

This makes the game usable as an AFK title: you can leave it running and return to find progress made. The listing does not describe any manual controls during these battles.

Dungeon vaults and collecting units

The game includes dark dungeon vaults to explore and combat that the listing describes as intense. Dungeons give the battles a different setting from the main fortress play.

The listing also highlights collection elements, so units and heroes are meant to be gathered across the game rather than used only once.

What's new

Oct 20, 2026

Update 2.1.20
- Iris's Special Request: Adventures, Dungeons, Raids, new heroes, 10,000 Summon Tickets and rewards as you progress.
- Halloween (Oct 29–Nov 26): dungeon, shop, packs, Skin Summons.
- Pocky Day (Nov 11–25): gifts for 7 login days.
- Reflection Converter, Spacetime Regulator, Effect Preserver: effect values reduced by about 30%.
- Precision Parts' ATK SPD is now shown in total Power.
- Anubis's stacks reset on boss summon.
- Spanish added.

About this APK

The build we hold is Fortress Saga: Idle AFK RPG 2.1.20 (APKS split bundle) for Android 7.1 and up.

Version: 2.1.20; 43430
Requires Android: 7.1+
Target Android: 16

Package ID: com.cookapps.bm.fortresssaga
Format: APKS split bundle
Malware scan: Google Play Protect
Permissions: 22 declared · 2 sensitive; Modify files on your device
Read files on your device
Signed by: CN=Android, O=Google Inc.
Certificate SHA-256: 9f928d7da07ae89b6f69dfe4ca31885a114bfe2c2bdbd8ed8db4a5d7ad09ea73