Adapting books into video games has become a popular trend in the gaming industry, with franchises like The Witcher and Assassin's Creed achieving immense success.

However, not all adaptations have fared well, as seen with the unsuccessful video game adaptation of Eragon.

The success or failure of these adaptations depends on various factors, such as remaining faithful to the source material, delivering engaging gameplay mechanics, and creating an immersive world. In this article, we will delve into why some adaptations work while others don't, using The Witcher, Assassin's Creed, and Eragon as examples.


The Witcher 3 Cover Art

The Witcher franchise is a prime example of the successful video game adaptation of a book series. Based on the popular book series by Polish author Andrzej Sapkowski, the game series has become one of the most beloved and successful RPG franchises of all time.

One of the key reasons for the success of The Witcher franchise is the quality of the storytelling, which remains faithful to the source material. The Witcher game series has been praised for its compelling characters, immersive world-building, and engaging storyline.

The success of The Witcher franchise can be seen in the sales figures. The Witcher 3: Wild Hunt, the latest installment in the series, has sold over 30 million copies as of September 2020. The game has also won numerous awards, including the prestigious Game of the Year award at The Game Awards in 2015.

The success of The Witcher franchise can also be attributed to the efforts of CD Projekt Red, the developer behind the series. The studio has been praised for its commitment to quality and its willingness to listen to fans, resulting in a loyal and dedicated fanbase.


Putting players at the center of your game development ensures long-lasting success, you can learn more about our Player First mindset here.


Assassins Creed

Assassin's Creed is another example of a successful video game adaptation of a book series.

The game franchise, developed by Ubisoft, is based partially on the historical fiction book Alamut by Slovenian writer Vladimir Bartol.

One of the key factors contributing to the success of the Assassin's Creed franchise is the game's unique blend of history and action. Players take on the role of an assassin, exploring different historical periods and locations while completing a variety of missions and tasks. The game's storytelling and attention to historical detail have also been praised, allowing players to experience different time periods in a way that feels both immersive and educational.

The success of the Assassin's Creed franchise can be seen in its sales figures: as of October 2022, the series has sold over 200 million copies worldwide, making it one of the best-selling video game franchises of all time.

Another key factor contributing to the success of the Assassin's Creed franchise is Ubisoft's commitment to ongoing development and improvement. The franchise has evolved significantly over the years, with each new installment adding new features, mechanics, and gameplay elements. This has helped keep the franchise fresh and engaging for fans.


The success of The Witcher and Assassin's Creed franchises can be attributed to several key factors.

The games' storytelling, immersive world-building, and engaging gameplay have kept fans invested in the franchises, with CD Projekt Red and Ubisoft continuously improving and expanding the games over the years. Additionally, both franchises have been praised for their attention to detail.

Both franchises are now well beyond their original source material, with The Witcher Netflix TV show coming up on its 3rd season and Assassin’s Creed Mirage expected to be released in 2023 as a come-back to the franchise roots of stealth gameplay.


Eragon video game

On the other side of the coin, Eragon is a prime example of a video game adaptation that was not successful. Based on the popular book series by Christopher Paolini, the game was developed by Stormfront Studios and released in 2006. Despite high expectations and a loyal fanbase, the game was met with a largely negative reception.

One of the key reasons for the game's failure was its lackluster gameplay. The game was criticised for its repetitive combat mechanics and simplistic level design, resulting in a game that felt shallow and unengaging. Additionally, the game's controls were often clunky and unresponsive, making it difficult for players to fully immerse themselves in the game world.

Another issue with the game was its lack of faithfulness to the source material as the game took several liberties with the book's plot and characters, leading to a disjointed and confusing narrative that left fans disappointed. Additionally, the game's graphics and sound design were also criticised, with many feeling that the game looked and sounded dated even at the time of its release.

The lack of marketing and promotion for the game was also a factor in its lack of success. The game was released during a crowded holiday season and was largely overshadowed by more high-profile releases (The Legend of Zelda: Twilight Princess, Final Fantasy XII, …). Additionally, the game's tie-in to the Eragon film, which was also met with negative reviews, did little to generate interest or hype for the game.

While the game had a loyal fanbase and a popular book series to draw from, it ultimately failed to live up to expectations.


To create a successful video game based on a book, developers should remain faithful to the source material, offer engaging gameplay mechanics, create an immersive world with high-quality graphics and sound design, and effectively market and promote the game.

By combining creative vision and technical expertise, developers can create a game that captures the hearts of fans and becomes a beloved classic.


Testify can help you achieve that, learn more about our platform here.