is an action game with strategy elements released as an arcade video game by Sega in 1988. It was ported to the Master System, Mega Drive/Genesis, and TurboGrafx-CD.
Gameplay
In Gain Ground, players control one of a set of characters at a time, each with different weapons. To beat a level, players must reach the exit point with at least one character or destroy all enemies on the level before time runs out. There are forty levels in the arcade version of the game. The Master System and the Genesis/Mega Drive have fifty levels in the game.
Normal mode starts with three players. There are captive characters littered across all levels, which can be rescued by walking over, then escorting the controlled character to the exit point. If a player controlled character is killed, that character turns into a captive, except that they will disappear if the next active player controlled character dies, exits the level without them, or the player has no characters left in their party. In Hard mode, the player starts the game with all twenty characters, but all the captive characters are removed from the levels.
The game is over when all controlled characters in the party are killed without any reaching the exit. However, there are three continues which allow a player to restart the level with their original three characters.
The game consists out of four rounds, each having ten stages, where the tenth stage is a boss level. There are also ten completely new levels added to the Genesis/Mega Drive version, this Modern Epoch takes place in the streets of the city. The Master System version also has 10 newly themed levels, placed after other versions' final Round "Future," ostensibly taking place within the "Gain Ground Main System" itself according to its opening stage.
Round 1: Dark Ages
Round 2: Middle Ages
Round 3: Pre-Revolutionary China
Round 4: Present day (Mega Drive/Genesis version) Round 5: Future Round 6: The Final Era (Master System version)
Characters
There are twenty playable characters in Gain Ground, each with their own strengths and weaknesses. Each character has a minor, weak weapon which can be fired in any direction, and a special weapon which has different capabilities from the normal attack and which varies between characters.
The characters in Gain Ground also vary in which hand they hold their weapons, making it easier for some characters to shoot around certain walls and obstacles than others. When selecting a character for a situation, one must consider the character's speed, weapon type and range, and with which hands they hold their weapons.
In the Master System release, instead of named characters there are unnamed class-like "fighters." Player 1's fighters are blue and male while Player 2's are red and female; they play exactly the same but have different sprites and character portraits. The fighters fill the same roles as their more powerful arcade/console counterparts, but are simplified to better suit the lower specs of the Master System hardware. There is one unique exception; the "Ninja" class. This Master System exclusive class can leave a trap on the ground at their feet for enemies to walk into and take damage; this trap functions differently than the Fire Knight's special attack, as it is persistent on the playing field until an enemy walks into it, while the special attack that the Fire Knight can use disappears quite quickly and can only be shot upwards.
"Cyber" seems to be directly inspired by the titular hero of Robocop (1987), but instead of being silver, he has the same color-scheme as Iron Man from the Marvel Comics.
Johnny appears to be based on Max Rockatansky from Mad Max 2: The Road Warrior (1981). This includes his similar jacket and sawed-off shotgun.
Mars' appearance and use of a bow and arrow have drawn comparisons to John Rambo's appearance from the First Blood sequels, and also could be inspired by Hercules.
"Robby the Robot" is a subtle reference to the character from the vintage TV show, Lost in Space.
The "General" has been noted by players to bear more than a passing resemblance to M. Bison from Street Fighter II: The World Warrior (1991), although the final boss didn't appear until three years after this game's release. Players have nicknamed the character "Bison" due to the name "General" being rather generic.
Plot
From a Gain Ground flyer: