# The Great Unknown: Houdini's Castle HD

> Hidden object adventure game set in Houdini's castle to rescue a kidnapped husband. (iPhone/iPad app by JoyBits Ltd..)

- Source: https://appshunter.io/ios/app/the-great-unknown-houdinis-castle-hd/id879439249 (this page in markdown: same URL + `.md`)
- Developer: [JoyBits Ltd.](https://appshunter.io/developer/375374774)
- Category: Games, Adventure, Puzzle
- Price: Free with in-app purchases
- Rating: 4.30/5 from 18 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.0 · 249 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Japanese, European Portuguese, Russian, European Spanish
- Released: 2015-08-11
- Data updated: 2026-06-08
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/the-great-unknown-houdinis-castle-hd/id879439249/reviews.md

## What is The Great Unknown?

SOLVE THE MYSTERIES OF HOUDINI'S CASTLE

Beautiful Hidden Object Game Play Combined with Mysterious Adventure!
All Ages Game Play!

Your honeymoon is cut short when your plane crashes on an uncharted island. You awake to discover a madman has kidnapped your husband. To get him back, you'll have to use all your wits to pass his sinister tests and solve the mysteries of Houdini's Castle. Along the way, you'll uncover Houdini's secret past and learn about the brilliant apprentice who changed his life. Can you expose Houdini's greatest trick to save your husband and escape the island?

- Fantastic hidden objective & adventure game play
- 60 vivid and mystifying locations
- 2 search modes and over 300 hidden items to find
- Dozens of fascinating mini-games
- Rare videos and historical documents

## Key features

- Hidden object gameplay
- Mysterious adventure
- 60 vivid locations
- 300+ hidden items
- Dozens of mini-games
- Historical documents

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full version | $4.99 | one-time |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/the-great-unknown-houdinis-castle-hd/id879439249/reviews.md

### 5/5 — Fun fun fun

*2021-02-03, version 1.2*

Really engaging, lots of different puzzles, not easy. Kept me up way too late.

### 3/5 — Know This:  I Can't "Escape" This One!

*2016-02-22*

I'm glad I came across this game while searching for types of this genre through the App Store.  The storyline was interesting enough to hold my attention; I like the twist on Houdini and his adopted son as the villain.  The graphics were sharp and clear; the artwork contained brighter textured colors and details creating an almost realistic portrayal of the environment.  Unfortunately, I had no choice of difficulty even after checking my options.  Most developers understand that players expect customizable settings to fit their preferences.  You had a great journal to read the story as you progressed, and it also recorded clues to solve puzzles.  The inventory was labeled but not interactive.  The map transported you to any location; however, there were no tasks or objectives indicated.  You still had to jump around to find something to do.  There was a hint button, and there were directional back arrows.  You also are given a Strategy Guide.  The HOS are two types:  word lists with mild interaction and a fun association type where you put objects into the scene, such as giving a carrot to a rabbit.  The puzzles are varied, simple, and fun; there were rotational types, as well as sequence or order based types.  The bonus game had some new scenes as well as recycled ones.  The reasons I took off two stars were the following:  1.  You could not zoom up in the HOS making it hard at times to identify the objects. 2.  Loading between scenes was delayed by a few seconds.  3.  The map should indicate tasks or objectives.  4.  No difficulty modes offered. 5.  Throw in some collectibles to spice it up a bit.   6.  I was thrown out of the game several times, and I have updated software.  7.  The price should be no more than $3.99.  Other developers offer games for less money, and I think the length of the game was average.  It moved very fast.  Even with the aforementioned issues, the game still deserves a solid salute!  It was fun to play.

### 1/5 — Fun but crashes. Keeps losing profile.

*2016-01-31*

I purchased the game because I thought it was fun to play and it was. Great puzzles. Good story. Got close to then end and crashed. Says it lost my external profile. Started me over from the beginning of of the story. Now whenever I play after a short while it. Crashes and starts over. Don't buy. Too buggy.

### 2/5 — Too bad

*2015-08-31, version 1.2*

Had the potential to possibly be a decent game, however here are the issues:
Every new room you go into, an ad pops up
Every game you play, an ad pops up
There is zero difficulty as your items are highlighted with sparkles
Although 2 separate options, when I turn the music off - the touch sounds, character voices etc. also go off

### 5/5 — Entertaining

*2015-08-22*

It's a joy!

## Frequently asked questions about The Great Unknown

### What is Houdini's Castle HD about?

Houdini's Castle HD is a hidden object and adventure game where players solve mysteries within Houdini's castle to rescue a kidnapped husband. It features puzzles, mini-games, and historical elements.

### Does Houdini's Castle HD have ads?

No, Houdini's Castle HD does not contain advertisements. It offers an uninterrupted gaming experience.

### What devices can I play Houdini's Castle HD on?

Houdini's Castle HD is currently supported on iPad devices. It is designed for Apple's tablet platform.

### How many locations and items are there in Houdini's Castle HD?

The game features 60 vivid locations and over 300 hidden items to find across two different search modes. This provides ample content for players to explore.

### Is Houdini's Castle HD suitable for all ages?

Yes, the game is designed for all ages, indicated by its 4+ age rating. It offers gameplay mechanics that are accessible to a wide audience.

### What kind of mini-games are included in Houdini's Castle HD?

Houdini's Castle HD includes dozens of fascinating mini-games integrated into the adventure gameplay. These offer variety and challenge beyond the core hidden object puzzles.

### When was Houdini's Castle HD last updated?

Houdini's Castle HD was last updated on August 11, 2015, with version 1.2. The game was initially released on August 11, 2015.

### What is the user rating for Houdini's Castle HD?

Houdini's Castle HD has a positive user rating of 4.3 stars based on 18 ratings. This suggests a generally well-received player experience.

## Version history (last 1 release)

### 1.2 — 2015-08-11

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by JoyBits Ltd.

- [Doodle God™](https://appshunter.io/ios/app/doodle-god/id376374689)
- [Doodle Devil™ F2P](https://appshunter.io/ios/app/doodle-devil-f2p/id393867262)
- [Doodle Devil™](https://appshunter.io/ios/app/doodle-devil/id418925394)
- [Doodle God: Alchemy & Sandbox](https://appshunter.io/ios/app/doodle-god-alchemy-and-sandbox/id427157971)
- [Doodle Farm™](https://appshunter.io/ios/app/doodle-farm/id427804316)
- [Doodle Farm™ Lite](https://appshunter.io/ios/app/doodle-farm-lite/id453002174)

All apps by JoyBits Ltd.: https://appshunter.io/developer/375374774

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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 2026-06-08.*