# Castle Defense Online - 4p — Castle Defense Online

> Real-time cooperative tower defense game with character collection and strategic building. (iPhone/iPad app by donghwan kim.)

- Source: https://appshunter.io/ios/app/castle-defense-online-4p/id1498738214 (this page in markdown: same URL + `.md`)
- Developer: [donghwan kim](https://appshunter.io/developer/1498738213)
- Category: Games, Strategy
- Price: Free with in-app purchases
- Rating: 4.20/5 from 100 App Store ratings · 218 written reviews indexed
- Age rating: 9+
- Requires: iOS 15.0 · 438 MB
- Languages: American English
- Released: 2020-05-15
- Data updated: 2026-09-04
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/castle-defense-online-4p/id1498738214/reviews.md

## What is 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?

## Key features

- Real-time 4-player cooperative play
- Easy 2D horizontal scroll controls
- Collect unique characters and skills
- Upgrade with runes and relics
- Build strategic towers
- Guild system for social play

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Diamonds 500 | $0.99 | one-time |
| Diamonds 10000 | $9.99 | one-time |
| 패키지 7 | $22.99 | one-time |
| 패키지47 | $6.99 | one-time |
| 패키지 10 | $1.99 | one-time |
| 패키지27 | $12.99 | one-time |
| 패키지 28 | $6.99 | one-time |
| 패키지 40 | $34.99 | one-time |
| 패키지 42 | $34.99 | one-time |
| 패키지20 | $34.99 | one-time |
| 패키지 39 | $34.99 | one-time |
| 패키지 4 | $6.99 | one-time |
| 패키지 1 | $6.99 | one-time |
| 패키지13 | $19.99 | one-time |
| 패키지15 | $19.99 | one-time |
| 패키지30 | $6.99 | one-time |
| 패키지 34 | $2.99 | one-time |
| Diamonds 1000 | $0.99 | one-time |
| Diamonds 5000 | $4.99 | one-time |
| Diamonds 50000 | $34.99 | one-time |


## What do users think of Castle Defense Online?

Overall sentiment: positive

**Pros**

- 👍 Good gameplay mechanics
- 🎨 Cute character designs
- 🤝 Enjoyable co-op experience
- 🕹️ Variety of game modes
- 💎 Generous rewards/currency system

**Cons**

- 🔁 Repetitive gameplay
- 🔄 Difficulty spikes in higher levels
- 🏆 Reliance on high-ranked players for progress
- 🌐 Lack of solo/single-player options
- 🌆 Cluttered UI with too much information

**Commonly reported bugs**

- Crashes and freezes on certain devices
- Inconsistent reward/progression tracking
- Login/account issues after updates

**Most requested features**

- Difficulty adjustment options
- More solo/single-player content
- Improved UI organization
- Account/progress transfer between devices

## Recent user reviews (10 of 218)

All indexed reviews: https://appshunter.io/ios/app/castle-defense-online-4p/id1498738214/reviews.md

### 5/5 — Needs more people

*2026-07-05*

Good game nice 4p tower defense game, love the item buying. Wish it had more players though

### 5/5 — 오류해결부탁드려용

*2026-07-03*

게임 잘하고있습니다. 다만 무한의 탑에서 지속적인 오류로, 지속 딜로 초마다 10데미지 입고있습니다. 원래 그런 맵이라고 하기엔 10회 피격시 지는 게임이기도 하고 유튜브 영상들을 찾아봐도 지속 딜이 있는 단계는 아니더라구요. 현재 48층을 이 문제로 못 깨고있고 다른 층에서도 이런 오류가 조금씩 있었습니다. 확인 부턱드립니당.

### 4/5 — Fun game but it crashes every time I finish a game.

*2026-06-13*

This is a pretty fun game to play, however it tends to crash after every game.

### 4/5 — 개발자님 꼭 읽어주세요

*2026-03-02*

저는 성지키기 온라인을 5-6년전부터 햇던 사람입니다 오랭만에 옛 향수를 느끼고 싶어 게임을 다운로드한뒤 게임을 하려는데 방 목록에 방이 뜨지도 않고 방을 만들어도 다른사람한테 안보이고 아무것도 할 수 가 없엇습니다 설정을 누르면 보이는 핑과 버전도 이상하게 뜨고 핑이 0이라 뜨고 버전이 24라고 뜹니다 다른서버로 전환해도 아무것도 안뜨고 그냥 다른 사람 방을 찾아 들어가서 같이 게임하는게 아예 불가합니다
그리고 제 친구에게 앱을 깔게 해서 화면을 보니깐 애초에 저랑 화면이 다르고 무슨 다른 게임 마냥 UI가 다릅니다
그래서 업데이트가 안됫나 봣는데 버전도 2월 20일날 업데이트 된 2410인가 그걸로 잘 되있고 게임도 몇번이나 지웟다 깔고 재부팅도 해보고 별짓을 다 해놨는데 그냥 안됩니다 오늘만 해본게 아니라 어제도 시도해봣는데 안됩니다 문제 해결좀 부탁드립니다 옛날 계정 날라간것도 서러운데 이제는 뭐 그냥 게임을 조차 못하게 하네요

### 3/5 — It’s alright

*2025-12-14*

The concept and mechanics of the game are really good but it feels a bit unbalanced in execution especially if you’re a solo player and don’t get assisted by max ranked players. The game feels like you have to rely on professional players to make any progress. The boss mode is alright, it’s not the main gameplay mode but I’d still like to talk about it. Nearly Half of the attacks are impossible to no-hit or avoid. Such as the projectile spam bosses (even the ones on level 1) but the boss mode is alright I suppose. And my final critique is some of the text in the ui feels cramped especially the global chat on the bottom of the screen, there’s just way too much at once on the screen and can overstimulate some people. It’s an alright game. I remember it being better last time I played years back though.

### 5/5 — 真的很好玩啦 到底有沒有人要玩

*2025-09-21, version 2307*

要玩找我 哀居：5.chi_3o

### 1/5 — 被誤封

*2025-09-18, version 2307*

沒有用駭客和巨集，卻被封了14天

### 5/5 — Very Good!

*2025-08-28, version 2281*

I love the graphics and all. Really hope there’s a server for Singapore/Indonesia though.

### 5/5 — nice

*2025-08-22, version 2266*

new relic 😍

### 5/5 — Супер классная игра!

*2025-07-04, version 2236*

Игра крутая, только почините рекламу

## Frequently asked questions about Castle Defense Online

### What is Castle Defense Online - 4p?

Castle Defense Online - 4p is a real-time multiplayer defense game where up to four players can cooperate to stop incoming enemies. It features strategic tower building, character collection, and a guild system.

### What are the key features of this game?

Key features include real-time cooperative play for up to 4 users, easy 2D horizontal scroll controls, collecting unique characters and skills, strengthening with runes and relics, building diverse towers for strategic play, and joining guilds to grow with friends.

### Is Castle Defense Online - 4p free to play?

Yes, the game is free to download and play. It offers in-app purchases and may also feature advertisements.

### What kind of enemies and challenges can I expect?

Players will encounter a variety of enemies, from cute creatures to scary jungle monsters. The game also includes challenging impossible bosses that require strategic planning and teamwork to defeat.

### How does the cooperative gameplay work?

Up to four players can join together in real-time to defend their castle. This cooperative mode allows players to combine their strategies, character abilities, and tower placements to overcome the waves of enemies more effectively.

## Version history (last 5 releases)

### 2568 — 2026-08-21

"2026-08.21 
Guild Reorganization

Balance Patch

Other Bug Fixes"

### 2530 — 2026-07-23

"2026-07-30
Beast Transcendence Added

New Skins Added

New Skill Skins Added

Other Bug Fixes"

### 2513 — 2026-07-06

2026-07.06 Other bug fixes

### 2507 — 2026-06-26

"2026-06-25

7th Anniversary Update

Transcendence Equipment Added

Mine Revamp

Arena Mode Added

UI Revamp

New Raid Added

Attendance Check Revamp

Guaranteed Black Crystal Drop

Artifacts Added

7th Anniversary Event in Progress

Raid HP Adjustments

Other Updates

Other Bug Fixes"

### 2500 — 2026-06-24

"2026-06-25

7th Anniversary Update

Transcendence Equipment Added

Mine Revamp

Other Bug Fixes"

## Apps similar to Castle Defense Online

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Impossible Luck Defense 2](https://appshunter.io/ios/app/impossible-luck-defense-2/id1550732116) | 5.0 (5) | Free | Games |
| [Castle Defense-Raising Archer](https://appshunter.io/ios/app/castle-defense-raising-archer/id1581048068) | 4.6 (9) | Free | Games |
| [Tower Defense King](https://appshunter.io/ios/app/tower-defense-king/id1164861766) | 4.4 (414) | Free | Games |
| [King God Castle: Luminous Fate](https://appshunter.io/ios/app/king-god-castle-luminous-fate/id1526791430) | 4.6 (1,903) | Free | Games |
| [Ace Defender](https://appshunter.io/ios/app/ace-defender/id1556005348) | 4.1 (1,300) | Free | Games |
| [Random Dice: Defense](https://appshunter.io/ios/app/random-dice-defense/id1462877149) | 4.6 (52,879) | Free | Games |

## More apps by donghwan kim

- [길드키우기 : 운명의 소용돌이](https://appshunter.io/ios/app/id1573379452)
- [킹 온라인](https://appshunter.io/ios/app/id1629860723)
- [Castle Defense Online 4p](https://appshunter.io/ios/app/castle-defense-online-4p/id6569254484)
- [미니 디펜더스: 방치형 디펜스 게임](https://appshunter.io/ios/app/id6737835707)

All apps by donghwan kim: https://appshunter.io/developer/1498738213

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-04.*