Hi! No worries about your English
Yes, this is possible. In many cases this happens when the game is running in exclusive fullscreen.
Thaluna works best when the game is in windowed or borderless window mode.
You can quickly check this:
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Start the game
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While the game is running, click on the Thaluna window so it has focus
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Try translating text again
If translation starts working after Thaluna gets focus, it means the game is blocking screen capture in fullscreen mode. Switching the game to windowed mode should fix it.
If Thaluna works in other games but not in this one, it’s very likely a fullscreen or emulator-specific limitation.
Regarding NDS / emulator games:
It can work, but results depend on:
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emulator rendering method
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fullscreen vs windowed mode
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font and visual style used by the game
If the translation works but the text recognition is inaccurate, you can try enabling Pixel OCR / Artistic OCR mode in settings. Some games use stylized fonts that are harder to detect in standard OCR mode.
Give it a shot and let me know if it works!