Celsius online is an independent studio creating video games, websites and mobile apps since 2004. The secret of our longevity? Our passion, the satisfaction of our customers and demanding games constantly evolving.

  • Renaissance Kingdoms

    Free Massively Multiplayer Management and Role-Playing Game

    For more than ten years, the internationally acclaimed Renaissance Kingdoms has been translated in 26 languages and become the first massively multiplayer role playing browser game in Europe. In this persistent world simulation of 15th century Europe, you play a character taking part in the economical, political and social life of his/her village, county and kingdom in Renaissance Kingdoms.

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  • Mutants: Genetic Gladiators

    mobile, tablet and Facebook game

    Become the ultimate psy captain!
    Compete against other players from around the world and be victorious to climb the ladder and win magnificent prizes. In the battle, team up with your friends to build a strong selection of allies to call to help your team.

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  • The Werewolves of Millers Hollow Online


    The official online adaptation of the popular board game "The Werewolves of Millers Hollow"
    Nothing seems out of place in the quiet and ordinary village of Millers Hollow, but each night, some villagers turn into vicious werewolves, ready to eat up other innocent villagers. Whose side are you on?

  • Best Web Game 2014

    March of History

    Free Massively Multiplayer Strategy Game

    Mixing real-time strategy, management and diplomacy, March of History takes you in Medieval Europe where you play a noble family intent on perpetuating the name of their House through the sound and the fury of History, from year 1000 A.D. to the nuclear bomb.

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Our skills

A talented team

With a strong team of 50 passionate people with advanced skills in their own field, we are ready to carry out any project you entrust us with, from development to user acquisition.

Webdesign and Ergonomics

We are pioneers in the use and development of cross-platform technologies, content must be accessible to everyone and everywhere, on any type of support (Responsive Design), with a navigation that is both pleasant and efficient for users.

Innovation and Web Development

For more than 5 years, we have been creating virtual reality (VR) or augmented reality (AR) experiences for companies or cultural institutions.


With 9 years of experience, on the Unity engine, we are able to accompany you for all types of services: Development of complete games, interactive experiences, code audit, etc.