Undead castle vs Mermaid Hidden Objects
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Undead castle
A casual puzzle game where the goal is to open doors by solving hidden object puzzles. It offers a variety of challenging brain teasers and uses different interaction methods like clicking and sliding. Continuously updated with new puzzles, it's a free and addictive experience.
- Room escape gameplay
- Hidden object puzzles
- Challenging brain teasers
- Multiple interaction methods
- Constantly updated puzzles
- Free to play
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This is a room escape/back-room escape type game,decrypted is a casual puzzle game,the object of the game is to open the door. All hidden objects to solve puzzles in the Chamber and into the next room. In this fun,addictive,free and popular puzzle game to challenge yourself. Room escape type game,lots of puzzles and poke your brain,challenging puzzles,and through a variety of actions,click,slide,g-sensor,and so on for the game. Each door is a puzzle,by drop dots on the image leads to crack open the door,a lot of extremely difficult puzzle game,constantly updated. How to play: complete all missions in the game,in the game unimpeded. you can also share it with your friends,come experience the fun. The game features Come and play!
Mermaid Hidden Objects
Explore enchanting underwater scenes filled with mermaids and ocean life. Search for hidden treasures, jewels, and seashells across various levels. Utilize hints and zoom features to aid your search, with the option to skip challenging levels and replay them later with new object arrangements.
- Underwater mermaid and ocean scenes
- Find hidden treasures and jewels
- Hint and zoom functionality
- Skip levels and replay
- Unlockable levels with new objects
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Mermaid Hidden Objects is most beautiful hidden object game. Enjoy cute scenes with mermaids, ocean, underwater animals and scenes. Find treasure, jewels, corrals, seashells and much other mysterious items. You goal is to find series of hidden objects on each level. Use Hint and Zoom buttons to find items quickly. If you can not complete any level you can simple skip it and try to complete it later. Completed levels will be unlocked and you can replay them with different hidden objects set. When you complete the game press More Games button to install more hidden object games.
Screenshots
Verdict
The clearest difference is review sentiment: Undead castle at 67% against Mermaid Hidden Objects's 0%. Undead castle also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 4). On price, ratings volume, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Mermaid Hidden Objects sells 4 one-off in-app purchases. Undead castle asks for nothing beyond the download.
Undead castle holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 7 and 3 respectively. Written reviews point the same way: 67% of Undead castle's written reviews are positive against 0% of Mermaid Hidden Objects's.
Undead castle ships an update every 11 months, Mermaid Hidden Objects every 52 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | Undead castle | Mermaid Hidden Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (7 ratings) — better | 2.0 (3 ratings) |
| Positive reviews | 66.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 7 — better | 3 |
| Update frequency | Every 11 months — better | Every 52 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 39 MB | 192 MB |
| Age rating | 12+ | 4+ |
| Developer | 娟 杜 | John Smith |
Customer experience
Undead castle
Mermaid Hidden Objects
In-app purchases
Undead castle
No in-app purchases
Mermaid Hidden Objects
- Hint object$0.99
- Skip level$0.99
- Unlock all levels$1.99
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- Remove Ads$1.99
Questions
Is Undead castle free?
Is Mermaid Hidden Objects free?
Which has better reviews, Undead castle or Mermaid Hidden Objects?
Do Undead castle or Mermaid Hidden Objects have ads?
Which is updated more often, Undead castle or Mermaid Hidden Objects?
Other comparisons
