Polygondwanaland first appeared as a partial leak on the band's demos for the album. The leak was uploaded to SoundCloud but was soon taken down. As a result, news of the album was scarce and mostly involved rumours, one of which stated that it would be the last of the five albums released in 2017. The track "Crumbling Castle," which appeared on the demo, was performed live by the band as early as September 2016, albeit in a much shorter form. However, it lay dormant for many months during an especially prolific period for the band, leading to speculation that the track might have been scrapped. Both the track and the music video were finally released on 18 October 2017, exactly one year after the first performance of the song was uploaded to YouTube. The legitimacy of the demos was all but confirmed at this point, as not only did the track feature the album's name in the lyrics, but it also contained lengthy musical passages equal in duration to the demo. Polygondwanaland was officially announced on the band's Facebook page on 14 November 2017. The release date and cover art were publicized by the band, who stated, "This album is FREE. Free as in, free," encouraging fans to make their own copies and bootlegs of the album.
1) Crumbling Castle
3) The Castle In The Air
4) Deserted Dunes Welcome Weary Feet
5) Inner Cell
10) The Fourth Colour