The module contains two different games. Cavern Blaster is originally "Laser Gates" by Imagic. City War is originally "Atlantis", also from Imagic.
Company Information
Neckermann was another mail order company like Quelle or Otto Versand in Germany founded by Josef Neckermann in 1948. They advertised their HES (Home Entertainment Suppliers) games in the early ninties in a huge catalog with the possibility of ordering them with postcard or telephone.