Cassette 50 (in Spain released as "Galaxy 50 - 50 Excitantes Juegos") was a compilation of games published by Cascade Games Ltd. The compilation mostly consisted of games not published independently and included a Timex digital calculator watch.
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 games were universally considered awful.
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.
The games featured differed depending on platform.
For Acorn Electron / Commodore 64 / ZX81:
Attacker
Barrel Jump
Black Hole
Boggles
Cannonball Battle
Derby Dash
Do Your Sums
Dynamite
Exchange
Force Field
Galactic Attack
Galactic Dog Fight
Ghosts
Hangman
High Rise
Inferno
Intruder
Ivasive Action
Jet Flight
Jet Mobile
Lunar Landing
Maze Eater
Motorway
Nim
Noughts and Crosses
Old Bones
Orbitter
Overtake
Parachute
Phaser
Planets
Plasma Bolt
Pontoon
Psion Attack
Radar Landing
Rats
Rocket Launch
Sitting Target
Ski Jump
Smash the Windows
Space Mission
Space Search
Space Ship
Star Trek
Submarines
Tanker
The Force
Thin Ice
Tunnel Escape
Universe
For ZX Spectrum:
Alien
Alien Attack
Attacker
Barrel Jump
Basketball
Blitz
Boggles
Bowls
Breakout
Cargo
Cars
Cavern
Crusher
Cypher
Draggold
Field
Fishing Mission
Galaxy Defence
Inferno
Jet Mobile
Labyrinth
Laser
Lunar Lander
Martian Knock Out
Mazer Eater
Microtrap
Motorway
Munch
Muncher
Mystical Diamonds
Nim
Orbit
Pinball
Race Track
Raiders
Sketch Pad
Ski Jump
Ski Run
Skittles
Solar Ship
Space Mission
Space Search
Star Trek
Stomper
Tanks
Ten Pins
The Race
The Skull
Voyager
Source: Wikipedia, "Cassette 50", available under the CC-BY-SA License.