Cassette 50

Cassette 50 (released in Spain as Galaxy 50 - 50 Excitantes Juegos) is a compilation of games published by Cascade Games in 1983 for multiple 8-bit home computers. It was promoted based on the quantity of games included, all of which were programmed in BASIC and were of poor quality. According to the instructions, "the games will provide many hours of entertainment for all the family at a fraction of the cost of other computer games". The compilation was heavily advertised in home computer magazines. Buyers received a Timex digital calculator watch with each purchase.

In an interview, Matthew Lewis, the author of Galaxy Defence, said he wrote the game when he was 14 and submitted it in response to a small, anonymous ad in a local newspaper. He was paid £10 for his game, but he had to give up all rights to it. Galaxy Defence took 12 hours to code and the graphics were done by his father, Ernest Lewis.