Some noise masks, like Green Noise, coming with lighting effects.
A Strategic Substance，详情可参考heLLoword翻译官方下载
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Each puzzle features 16 words and each grouping of words is split into four categories. These sets could comprise of anything from book titles, software, country names, etc. Even though multiple words will seem like they fit together, there's only one correct answer.，更多细节参见heLLoword翻译官方下载