An unofficial third expansion pack, Abyss of Pandemonium, was developed by the Impel Development Team, published by Perfect Publishing, and released on April 14, 1998; an updated version, version 2.0, titled Abyss of Pandemonium – The Final Mission was released as freeware.
Resmi olmayan üçüncü eklenti paketi, Abyss of Pandemonium, Impel Development Team tarafından geliştirldi, 14 Nisan 1998 tarihinde Perfect Publishing tarafından yayımlandı; güncellenmiş bir sürümü, version 2.0, Abyss of Pandemonium – The Final Mission diye adlandırımdı ve ücretsiz olarak dağıtıldı.