Mad Stalker: Full Metal Forth
is a side-scrolling beat 'em up video game originally developed by Fill-in-Cafe and published by Family Soft exclusively for the Sharp X68000 in Japan on 14 January 1994. It is the fourth title to be created and released by both Fill-in-Cafe and Family Soft for the X68000 platform late into its commercial life span, after being discontinued in 1993 by Sharp Corporation with the last model launched. Set in a futuristic post-war setting during the year 2142, players assume the role of a policeman taking control of a SlaveGear mecha suit named Hound Dog in an effort to protect the fictional city of Artemis by defeating another SlaveGear model known as Rising Dog and stopping Omega, an artificial intelligence that has turned antagonistic against humankind. Its gameplay mainly consists of action mixed with fighting elements using a main two-button configuration.
Though it was initially launched for the X68000, Mad Stalker: Full Metal Forth was later ported to other home computers and consoles such as the FM Towns and PC Engine Arcade CD-ROM², with each one exhibiting several changes and additions compared to the original incarnation, while all versions of the game are Japanese-exclusive. In 1997, the title was substantially remade for the PlayStation. Both the X68000 and PlayStation versions have since been re-released through download services such as Microsoft Windows and PlayStation Network respectively. A conversion for the Sega Mega Drive was in development and even previewed, however it did not receive an official release to the public.
Despite its late initial launch, Mad Stalker: Full Metal Forth received positive reception from critics who praised multiple aspects such as the graphics, sound design and gameplay, becoming a relatively popular title among the X68000 userbase from Fill-in-Cafe that would lead it in being nominated for a "Game of the Year" award by Japanese magazine Oh!X before ultimately losing against other titles on the system. Former Treasure designer Tetsuhiko Kikuchi cited the game, alongside Capcom's 1994 Alien vs. Predator arcade game, as one of the main inspirations for Guardian Heroes on Sega Saturn.