Castle Defense Online

Black Hammer Strategy In-app purchases Contains ads

The game that falls in love :)
Real-Time Multiplayer Defense!

Rating: 4.0; 25.4K ratings
Downloads: 1.4M+; on Google Play
Price: Free; In-app purchases
Updated: Oct 12; 2026 · v2599

Get it onGoogle Play See alternatives

Screenshots

About Castle Defense Online

The world's first real-time multiplayer defense game.
Castle Defense Online!

1. 4 users can play cooperatively in real time.
2. Easy control with 2D horizontal scroll.
3. Collect unique characters, powerful skills, and various items.
4. Become stronger with 50 runes and 30 relics.
5. There are cute enemies and scary jungle monsters.
6. Clear the impossible bosses.
7. Build towers that can use a variety of strategies.
8. Meet and grow with friends in the guild.

Can you safely stop incoming enemies?

What’s new

Version 2599 · Updated October 12, 2026

2026-10-13 Other bug fixes

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User reviews

Michael Wu

The daily rewards don't seem to give the correct items and only gems 100+10(number of days) instead.

Anikin Martinez

The Discord server is ran by some random person and the way he runs it is so sloppy

SKILLEDJPI JPI

This game is so awsome im just suprised on how there are not millions! Playing this i hipe this game gets so much better!!

Matthew Donneil James

It is great for testing friendships and trust and truly addictive

can we get 100 subscribers without videos?

The best game ever I cant even explain it.

Angelo Mobley-Gregory

I believe that this game is one of the greatest mobile games I've played, because I love the graphics, I love the characters, and I love the gameplay, the only thing i think it needs is a new character because some of the people might have all the heros and that's awesome but they also might want a different charact...

App details

Castle Defense Online is a free Strategy app for Android with 1,000,000+ installs on Google Play and a 4.0/5 average rating from 25,439 ratings. It was released on April 18, 2020 and last updated on October 12, 2026. It's developed by Black Hammer. It requires Android 7.0 or later. The app contains ads and offers in-app purchases.

Category: Strategy
Rating: 4.0 / 5 (25,439)
Installs: 1,482,468
In-app purchases: Yes
Ads: Contains ads
Version: 2599
Requires Android: 7.0
Content rating: Everyone 10+
Released: April 18, 2020
Last updated: October 12, 2026
Developer: Black Hammer

View on Google Play

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Alternatives to Castle Defense Online

Looking for apps like Castle Defense Online? Here are 6 similar Android apps on Google Play. The highest rated is Realm Defense: Hero Legends TD (4.4/5), and all 6 are free to download.

Castle Defense Online vs. alternatives
App	Rating	Price	Installs	Last updated	Compare
Castle Defense Online	4.0 / 5	Free	1,000,000+	Oct 12, 2026
Towerlands: Tower Defense TD	4.2 / 5	Free	1,000,000+	Jul 10, 2026	Compare
Random Dice: Defense	4.3 / 5	Free	10,000,000+	Feb 11, 2026	Compare
Broken Universe: Tower Defense	4.2 / 5	Free	10,000+	Feb 15, 2022	Compare
Random Dice: Wars	3.9 / 5	Free	50,000+	Dec 24, 2021	Compare
Defense War	4.2 / 5	Free	–	Nov 11, 2020	Compare
Realm Defense: Hero Legends TD	4.4 / 5	Free	5,000,000+	Oct 24, 2026	Compare

Compare Castle Defense Online with the top alternatives: ratings, updates, ASO score and keyword gaps →