Pay attention to story bits amd conversations. They lead to the secret ending.
English
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I play it through with dialogue in Russian and English subtitles. Unfortunately there are no subtitles for the conversations people are having in the background. I'll play it in English on second playthrough.
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English is a bit shaky for this game. Some lines are read awkwardly and does not carry that emotional weight that needs to be there. Russian, however, did that perfectly even though I needed my English subtitles.