Super fun!
Great game design, easy to play, and keeps you engaged
Free
In-App PurchasesWith Ads
About
Defend your reactor core from waves of rogue machines in this deep tower-defense game. Permanently unlock upgrades and new abilities with each run, creating unique defenses. Strategize with a variety of turrets, evolutions, and a dynamic tech tree.
✓Deep tower-defense gameplay
✓Permanent Mastery XP unlocks
✓Twelve turrets with evolutions
✓Dynamic run-wide tech tree
✓Customizable turret targeting
✓Daily challenges and modifiers
✓Offline play
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+1
What's New in Reactor Defense
2.1
October 22, 2026
1
Subscriptions & In-App Purchases
$4.99
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User reviews
FAQ
What is Reactor Defense?
Reactor Defense is a deep tower-defense game where players defend a reactor core from incoming enemies. It features permanent progression systems and a variety of turrets with unique evolutions.
Does Reactor Defense have ads?
Yes, Reactor Defense contains advertisements. Players can opt to watch ads for rewards, and a one-time purchase is available to remove ads permanently.
Can I play Reactor Defense offline?
Yes, Reactor Defense is fully playable offline. No account or sign-in is required, and your progress saves automatically, making it convenient for on-the-go play.
What are the permanent upgrades in Reactor Defense?
Players earn Mastery XP from each run, which can be spent on permanent upgrades. These include increased per-turret damage, range, fire rate, starting scrap, core strength, and the ability to lift turret level caps.
How many turrets are available in Reactor Defense?
There are twelve distinct turrets in Reactor Defense, each with twelve possible evolutions. These evolutions allow turrets to specialize further and unlock powerful signature abilities at max level.
Is Reactor Defense pay-to-win?
No, Reactor Defense is designed to be free to play and not pay-to-win. While there are optional in-app purchases and ads for rewards, the core gameplay and progression are not dependent on spending money.
What devices can I play Reactor Defense on?
Reactor Defense is currently supported on iPhone and iPod devices. The game is rated for ages 12+.
How often is Reactor Defense updated?
Reactor Defense was last updated on October 22, 2026, with version 2.1. The release date was also October 22, 2026, suggesting recent development activity.