The page is to difficult to understand. I knew the game but I never heard the name. https://en.wikipedia.org/wiki/Klotski After realizing it's "that" game it easy easier to understand. (Perhaps the author should add a link to Wikipedia or something.)

This is an interactive accompaniment to a video that contains more information: https://www.youtube.com/watch?v=YGLNyHd2w10 (previously discussed a bit at https://news.ycombinator.com/item?id=45002866)

The name is likely an anglicised version of "klocki" just meaning "blocks" in Polish. ( in Polish 'c' is just a "ts" not a "k", so "cumani"->"tsunami" and "Ghosts of Tsushima" -> "Ghosts of Cushima", or "pec" -> "pets", so also those last name of "cki" ... just end in "tski")