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Screenshots

  • Oops! Defense screenshot 1
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  • Oops! Defense screenshot 3
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  • Oops! Defense screenshot 5
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  • Oops! Defense screenshot 8

About Oops! Defense

200 heroes, thousands of monsters, one last castle. Oops again!

Oops! Defense is a simple yet hilarious defense game!
Summon heroes and stop the endless waves of monsters to protect your castle.
Defeat giant bosses, collect hidden relics, and grow even stronger.
Anyone can start easily, but surviving to the end won’t be so easy.

[Features]

Easy tap controls with thrilling defense battles

Over 200 unique heroes and companions

Massive bosses and endless monster waves

Relics and treasures to collect and upgrade

Multiple modes: siege, defense, time attack, and more

Relics to collect, castles to defend, bosses to beat… busy, busy Oops! Defense!
And yet you tap again. And again. And laugh again.

What’s new

Version 1.20.00 · Updated September 29, 2026

・Event starts ・Bug fix

Alternatives to Oops! Defense

Looking for apps like Oops! Defense? Here are 6 similar Android apps on Google Play. The highest rated is Elroi : Defense War (4.5/5), and all 6 are free to download.

Oops! Defense vs. alternatives
App Rating Price Installs Last updated Compare
Oops! Defense 4.5 / 5 Free 100,000+ Sep 29, 2026
Level Up Village! 4.4 / 5 Free 100,000+ Jul 27, 2026 Compare
F Class Adventurer : AFK RPG 4.3 / 5 Free 1,000,000+ Oct 12, 2026 Compare
Management: Lord of Dungeons 4.0 / 5 Free 500,000+ Jul 24, 2026 Compare
Elroi : Defense War 4.5 / 5 Free 500,000+ Jul 27, 2026 Compare
Idle 999th Hero:AFK RPG 4.4 / 5 Free 100,000+ Jul 27, 2026 Compare
Grow Slime Castle 3.9 / 5 Free 10,000+ Jul 27, 2026 Compare

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