Keroro RPG: Kishi to Musha to Densetsu no Kaizoku

Keroro RPG: Kishi to Musha to Densetsu no Kaizoku (ケロロRPG 騎士と武者と伝説の海賊), simply referred to as Keroro RPG, is a role-playing game exclusively for the Nintendo DS that was released on March 4, 2010 in Japan. Developed by Namco Tales Studio and published by Bandai Namco Games, the game is based on the popular Sgt. Frog franchise with gameplay elements from the Tales series of games, making it a spin-off of the main series.

Gameplay
Out of battle, Keroro RPG has similar gameplay to other titles in the Tales series. The player visits towns throughout the game, where they can talk to various NPCs, buy items, and progress the story. The player also visits dungeons, which contain various enemies, treasures, and puzzles. After battles, the player acquires gold to buy various things and experience points, which goes toward leveling the party. When traveling between towns and dungeons, the player travels through the field map, which sometimes contains no enemies.

Battle System
Unlike the other Keroro games, Keroro RPG uses the Linear Motion Battle System, or LMBS. Like previous Tales games, Keroro RPG uses 2D sprites with combat taking place on a single, two-dimensional line and is entirely real-time, with the player controlling one person and the others being controlled by A.I. if another person is not controlling them. Similar to the Tales games made for the Nintendo DS, only three party members are on the battlefield.

Every party member also has a "Combination Gauge", or CG. Through any kind of actions—like skills, jumps, backsteps or even basic attacks—the gauge is increased. This gauge is consumed when the player calls a non-battle party member to battle to perform one of that character's attacks or commands a battle party to perform a move, which is called a "Connect Command". The player is also able to use unison attacks by using a certain skill with the currently-controlled character and having another party member use another certain attack. The player also has the option of calling in characters from previous Namco Bandai games to use an attack.