This means that for the game to display French text and menus, you must ensure your Nintendo Switch console's primary system language is set to French. If your console is set to English, the game will launch and play in English. The game card and digital version sold in France and other French-speaking regions indeed contain the full French language data. Before purchasing, especially from international or third-party sellers, you should always double-check the product's language support information. However, for the standard European and North American releases, French is supported through this system-level setting.

Text prompts upon picking up an item clearly explain its vague or hidden effects in French.

: Les menus, les descriptions d'objets et l'interface sont entièrement disponibles en français pour une immersion totale. Comprendre le format NSP sur Nintendo Switch

The Binding of Isaac: Afterbirth+ on the Nintendo Switch is a landmark title. It is a "dungeon-crawling shoot-'em-up that's literally a different game each and every time you play it". The Switch version, with its hybrid nature and fantastic port, is widely considered the best way to experience this "roguelike classic". It supports French through your system settings and offers a seemingly endless amount of content that has become "the most varied, addictive dungeon-crawler ever made".