From the back cover:
"MEKTON is the complete system for giant Japanese Robot combat and roleplaying. Within these pages, you'll discover everything you'll need to be the heroic pilot of your own combat 'mecha,' whether in mass combat or in roleplaying adventure."
Primarily a combat system for giant robots with some role-playing on the side. Includes notes on the campaign world of Algol. Notably, this first edition uses percentil-roll mechanics, not the Interlock system employed by nearly all other R Talsorian games that followed, including later editions of Mekton.
The later Interlok versions of the game were called
Mekton II and
Mekton Zeta. A Fuzion version of the game was promised, but never released.