From the contents page:
Challenge, GDW's magazine of adventure gaming, is published quarterly and includes the Journal of the Travellers' Aid Society.
Cover artist: David R. Deitrick
Challenge goes bimonthly.
A ground attack module for Air Superiority.
Facts on mortar artillery.
Non-player characters for Twilight:2000.
Ship design for Sky Galleons of Mars.
Designer\'s notes for this game.
Martian canal design in Space:1889.
The science of the Ether in Space:1889.
A Belgians vs. Martians cloudship battle for Sky Galleons of Mars.
A pull-out section describing the history, science, personalities, Mars, cloudships, and the Royal Navy.
Current events in the Shattered Imperium.
Character generation system for MegaTraveller.
Running 2300AD battles using Ogre/GEV rules.
A French space plane design for 2300AD.