Contra (魂斗羅 コントラ Kontora?), distributed as Gryzor in Europe and Oceania, is a 1987 run and gun action game developed and published by Konami originally released as a coin-operated arcade game on February 20, 1987.[3] A home version was released for the Nintendo Entertainment System in 1988, along with ports for various computer formats, including the MSX2. The home versions were localized in the PAL region as Gryzor on the various computer formats and as Probotector on the NES, released later. Several Contra sequels were produced following the original game. The name of the game refers to the Contras, a group of CIA-backed Nicaraguan rebels who were frequently in the news in the United States in that period.

Maou Golvellius (魔王ゴルベリアス, lit. "Devil Golvellius") is an action adventure video game for the Japanese MSX home computer system. It was developed by Compile and released in 1987.

Sega licensed the franchise in 1988 and released their own remake of the game for the Sega Master System (the Mark III in Japan), featuring enhanced graphics and entirely different overworld and dungeon layouts. This version was released worldwide under the name Golvellius: Valley of Doom.

Later that year (1988), Compile released yet another remake for the MSX2 system, titled Shin Maou Golvellius (真・魔王ゴルベリアス, lit. "True Devil Golvellius"). This game featured mostly the same graphics as the ones in the Sega Master System version, but the overworld and dungeon layouts are entirely different.

In 2009 it was announced by DotEmu/D4 Entreprise that Golvellius was to be re-released for the iPhone OS platform.

The scenario is the same in all the three different versions of Golvellius. The ending promised a sequel, which was never developed/released. However, there is a spin-off game titled Super Cooks that came included in the 1989 release of the Disc Station Special Shoka Gou.

Guardic (ガーディック, Gādikku) is a shoot 'em up video game for the MSX computer. It was created and developed by Satoshi "Pac" Fujishima while working for Compile, the creators of other shoot 'em up games such as Zanac, The Guardian Legend, and Blazing Lazers.

Guardic is unique in that the player can choose stages, which are connected by a maze. Each stage is a non-scrollable single screen and has 1 to 3 groups of different enemies. The player can "buy" ship power-ups like speed, weaponry, and special powers before each stage—a departure from the traditional scrolling-shooter power-up system. In the end of each stage, the ship could safely fly through a scrollable maze to another stage.

Guardic is the second title in a MSX trilogy by Fujishima, which started with Final Justice (1985) and ended with Blaster Burn (1990). In this last installment the player commands Guardic II as its main weapon against Gose, an invasion army from outer space. It also inspired the sequel, and cult classic NES shooter, The Guardian Legend (known as Guardic Gaiden in Japan).

In August 2011 D4 Enterprise released an emulated version for iOS devices.