Different front cover than on official editions. Songs are listed sequentially over the sides. B4 title is misspelled as 'Sonar Seguences'.
Release with the same catalog number appears in two versions where main difference is look of the inlay. Initially the fonts were black and there was no annotation (in Polish) in the inlay: "Cassette for sale in the territory of Poland only". Another slight difference is color saturation of the front j-card artwork. In both editions cassette labels are exactly the same.