Hidden Object Games: Analysis, History, and Creation Process

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What do puzzles from magazines of the 90s and modern I Spy games have in common? What is the success formula for hidden object games, and how to create an interesting product in an unpopular genre? Let’s find that out.

What are hidden object games?

HOPA games (hidden object puzzle adventure) are casual games in which the player looks for hidden objects. The list of objects is presented in words, silhouettes, and anagrams, limiting the time to complete the level and complicating the process in various ways.

History of the genre and the first HOPA games

The original prototypes of casual I Spy games were in old magazines. The entertaining sections like Spot the Difference and Find 10 Objects are the progenitors of modern puzzles. Some will remember a series of magazines with colorful I Spy spreads. They featured Waldo, a guy in glasses and a red and white striped sweater, who hid in a large crowd of people and objects. There were also wimmelbooks, in which each illustration is a search scene.

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Where’s Waldo? The Fantastic Journey (Book 3)

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Alice: An Interactive Museum

At first, computer games used only basic mechanics in the hidden object genre – the search for objects and differences. One such HOG pioneer, Alice: An Interactive Museum, was created for Windows 3.x in 1991. The universe created by Lewis Carroll inspired the plot. The player walks around the 12 mysterious rooms of the mansion, collects 53 cards from the deck, and deciphers the clues to complete the game. The game’s navigation utilizes the mouse: the player clicks (often at random) on various objects, finds hidden cards, and moves on. Despite the sometimes frightening graphics and sounds, the game turned out to be very atmospheric and interactive.



The first major casual game developer to make headway in the hidden object genre was Big Fish Games. The popular Hidden Expedition series includes as many as 17 games. Starting with the computer game Hidden Expedition: Titanic, they captivated thousands of fans, and their follow-up game in the series, Hidden Expedition: Everest, was released for the iPhone.

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Hidden Expedition: Titanic, Hidden Expedition: Everest

It’s enough to know a couple of facts when understanding the scale of creating a hidden object game. Big Fish Games recruited the world-famous climber Edmund Viesturs as a consultant. They made him the main character of the game Hidden Expedition: Everest. And National Geographic was chosen as an information partner and supplier of photos and videos.

Analysis of the hidden object genre

While the first hidden object games were essentially adaptations of paper puzzles to find hidden objects and differences in pictures, the modern HOG games boast a variety of mechanics and a well-thought-out plot. In such quests, users are looking for not just a clicker game but also a fascinating story.

Therefore, modern developers will season their search sections with an interesting plot, mystery, colorful characters, humor, lively dialogue, and exciting cutscenes. This approach works not only to attract but also to retain the player. With each plot twist, the player is more involved in the process and history and more willing to return to the game.

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The main components of the hidden object game

I Spy games include the following elements and features:

  • Plot. When the genre was in its infancy, the story component in HOPA games was weak. Modern developers rely on narrative to create a successful product that will captivate players.
  • Search scenes. Those can be rooms of an old mansion, street locations, and even space landscapes. In search scenes, you need to look for hidden objects.
  • Main character. As a rule, in HOG, the player is the main character (and has to look for items), so we do not see this character. But also, one or more characters are often woven into the game, who act as guides for the game.
  • Logic should be everywhere: in the sequence of levels, the characters’ trajectory, and how the story ends. Consistency in selecting items for search scenes in hidden object games plays a big role. All hidden objects must correspond to the location and situation (for example, it would be weird to find a painting by a famous artist in a car dealership). Therefore, the relevance of each item in a hidden location should not raise questions.
  • Goal. The objects you find are either used for some task (find a bucket of paint and use it to update the facade of the building) or to earn points by searching to achieve a small goal and further progress. That is, the search is not aimless – the HOG player must clearly understand the meaning of what they are doing.
  • Difficulty levels. Developers often alternate easy levels with difficult ones so that players don’t get bored: they limit time, add obstacles, or encrypt the names of hidden objects.
  • Additional features can be a search inventory (with one click, players can get help in the search), in-game events, and competitions to increase interest and build the community.
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Search scene at Manor Matters (photo caption)

Hidden object quests: the creation process

A lot of work is required to make your hidden object game exciting, original, and, at the same time, popular for a long time. Therefore, the first item in the plan for creating a cool HOG project by VOKI Games was a large-scale study.

Based on its results, we determined the success factors of I Spy games:

  • Balanced content of search scenes. Empty locations and too “obviously hidden” items reduce interest in the game. Therefore, we filled the search scenes in Manor Matters with various thematic objects, skillfully inscribed them in the locations, and made these pictures come alive. We fill the locations in the game according to the principle of playable and non-playable items. Therefore, there are ordinary interior objects and accessories and those the player would have to find. Random clicking will not work here. When rendering search scenes and filling them with hidden objects, we take into account the resolution and brightness level of the player’s screen so that the search for objects remains possible and, most importantly, the challenge remains enjoyable.
  • Exciting plot. In addition to the main storyline, games often introduce additional ones into the hidden object scene. This makes the story exciting, reveals its idea, and allows you to introduce new characters and create your own game universe, where each player will find a hero who is close in spirit.
  • Beautifully detailed graphics and realistic animation enliven the plot, deliver aesthetic pleasure, and fill the game actions with a special I Spy charm. The creative approach to the art makes the player marvel at how the hidden objects are masterfully inscribed in various locations, creating an atmosphere of adventure. But because of this feeling, users choose hidden object games.
  • Interesting events make the hidden object game more dynamic and deep. Players enjoy prizes and bonuses, competitions, and achieving super goals.

Since the essence of hidden object games is to search, we focused on the quality of hidden locations. 

9 stages of working on search scenes


The idea behind each hidden object location in the game is carefully crafted to match the setting, theme of the game, or specific event (when it’s a seasonal or holiday update). The appearance of a new search scene should be logical: in a historical museum, there is the exposition of a politician’s office, and in an abandoned hotel, there is a cobwebbed room.


In the second stage, we collect a folder with photographs of premises and individual objects, which we take as an example when developing a new location. It is important not to forget that the future interior should match the atmosphere of the game, the visual style of the main art, and the era in which the game events occur.

Location sketch preparation

Inspired by the references, the artists create sketches of the future search scene. The goal is to draw multiple variations (often in black and white). The lead artists review the resulting sketches, and they choose one that is the most functional and meets the requirements. Next, we detail the final sketch, think out the lighting, and work on the perspective.

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A sketch of the future search scene for Manor Matters (photo caption)

3D modeling

At the 3D modeling stage, the sketch is handed over to a 3D artist who makes the location three-dimensional. We consider the objects’ real proportions so that the picture looks natural. As a result of modeling, we get a voluminous, detailed search scene.

2D processing

At the stage of 2D processing, we detail textures, improve perspective realism, lighten up overly dark areas, and touch up the image. The task is to bring the design of the hidden location to absolute unity with the visual style and atmosphere of the game. After that, we begin to animate locations.

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Final result (search scene at Manor Matters) (photo caption)


The animating factor creates an atmosphere. It’s important not to overdo it and not to draw too much of the player’s attention to moving objects. It’s enough for the animator to add smooth movements. Think of a gently swaying branch in the window if we are talking about a room, and in the case of a sea location, a couple of sparkling reflections on the water’s surface.


At this stage, we introduce hidden objects into the location. It’s important to consider the size of each object and its placement, ensure that all areas are adequately lit, and take into account that the game can be launched at a low display brightness.

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It’s also important to hide the item so that most of it is visible. An example of unsuccessful objectification is a fallen globe that lies behind a cabinet, and the player sees only its stand.

Players appreciate the creative approach to placing such objects. Let’s say our task is to hide the family coat of arms in the living room of the palace. Instead of simply hanging it on the wall, we can sew it with gold thread onto one of the sofa cushions. The player will not discover the emblem immediately, but such a find will heat up their interest in the gameplay.

Voice acting

At this stage, the search scene is filled with music and sounds. Ambient sounds play in the hidden location to enliven the result. For example, this may be a ticking clock hanging on the wall or the quiet crackle of logs. This technique creates the atmosphere.

Introduction of the location to the game

After taking all the steps mentioned earlier, the programmers introduce the location into the game. The result is tested, re-checked for display quality on different devices, and prepared for release.

This is such a complex and fascinating path that the team goes through when preparing each search scene. If you’re as enthusiastic about creating hidden object games as we are and want to dive into game development, make sure to have a look at our Vacancies section.