Yes, the Dual Subtitles mod for The Witcher 3 is an excellent tool for learning Polish, especially because the game's Polish writing and voice acting are native and authentic. It displays two languages side by side, letting you match spoken Polish with written text in both Polish and English, which reinforces vocabulary and grammar in context.
This mod works on Windows, Linux, and macOS (via Crossover), so it is widely accessible. The key benefit is that you see the Polish sentence and its translation simultaneously, which helps you build comprehension without pausing constantly. However, there are tradeoffs. First, the mod only works with in-game subtitles and dialogue, not with menus or UI text. Second, reading two lines can be visually distracting during fast action scenes. Third, you might rely too much on the English translation instead of actively parsing the Polish, so you need to discipline yourself to look at the Polish first.
To use it effectively, start by setting the game's audio to Polish and subtitles to Polish as your primary language, then add English as the secondary. Play at a slower pace, pausing when needed to study phrases. Keep a notebook or digital tool for new words. You can also adjust subtitle size and opacity in the mod settings to reduce clutter.
For a similar approach with Dutch, look for games originally developed in the Netherlands or with high-quality Dutch localization. Examples include Horizon Zero Dawn (Dutch studio Guerrilla Games) and the older Gothic series. Search for modding communities on Nexus Mods or Steam Workshop for dual subtitle mods. Alternatively, use language learning apps like LingQ or Readlang that let you import game text with translations, or watch Dutch Twitch streams with side-by-side subtitles using browser extensions. The key is to combine immersive input with active study, not just passive exposure.