A compilation of 6 games for a ZX81 with a 16K memory expansion module.

Lunar Landing
The lunar excursion module starts in a atable lunar orbit. You can control it to bring it a soft landing on the moon.

Twenty One
The card game of Twenty One

Combat
You are in a spacecraft equiped with 12 missiles with which you have to fight of aliens.

Substrike
Within a grid you have to fight of submarines using depth charges.

Codebreaker
A Mastermind like game

Mayday
You have to find a person lost in space (7x7x7 grid).