Hyperdimension Neptunia Mk2

While in a dungeon, various actions can be performed, mainly the Treasure Search and the Symbol Attack. When the O button is pressed, the player scans the area to find hidden treasure. Enemies now wander the map, and when the player character comes within their sight range, a red exclamation point will appear (a play on Metal Gear Solid), and they will chase the player. Hitting it with a Symbol Attack gives the player's party the upper hand, and may sometimes even defeat the enemy.

If the latter occurs, no rewards are gained. Likewise, if the player character is approached from behind, the battle will start with a Back Attack and the enemy will gain the advantage. Other items within dungeons include Sharicite Symbols that trigger events, Save Points, Common Items, Gathering Points that release ingredients for item synthesis, and a dungeon exit.

The year is 20XX, and in an alternate universe from the first game, where Arfoire is dead, a force known as ASIC (Arfoire Syndicate of International Crime), a group solely dedicated towards the deceased Arfoire, has risen, led by CFW Magic. Over the years, the influence of ASIC has become increasingly powerful, currently affecting many residents of Gamindustri. As such, in response to the threat, the CPUs and Nepgear travel to the Gamindustri Graveyard to combat ASIC. However, the five of them are overpowered and captured.

Three years later, IF and Compa arrive to find Neptune. With the power of the Sharicite, a crystal made from the hopes of people, the two manage to free Nepgear and escape, though the Sharicite is broken in the process. Retreating to Planeptune, Nepgear must recover her strength and free Gamindustri from the influence of ASIC, though she must first locate the mascots of the landmasses, who can provide the power to potentially assist the captive CPUs.

The game was developed with assistance from Nippon Ichi Software, Gust Corporation, 5pb., and Comcept by Keiji Inafune. It is the sequel to the previous game named Hyperdimension Neptunia, announced on April 12, 2011 for the PlayStation 3. It was released on August 18, 2011 in Japan, and was released in February 2012 in the United States and Europe. This is the first and so far the only game in the series to receive a Mature rating from the ESRB in North America. Hyperdimension Neptunia mk2 was made available as a downloadable title on the PlayStation Network in August 2012.

Hyperdimension Neptunia Re;Birth2: Sisters Generation is an enhanced portable version of the game for the PlayStation Vita developed by Felistella, announced by Idea Factory and Compile Heart during a streamed interview at Tokyo Game Show 2013. It was released on 20 March 2014 in Japan, and in January 2015 in North America and Europe. Re;Birth2 was released for PC on May 29, 2015. Nearly all of the original game's premises, such as story, missions and dungeons, were kept intact, however there were major changes in the game's visuals, such as the improved frame rate performance, sharper visuals and the usage of 2D character artworks in the dialogue scenes, replacing the 3D character models present in the original game. Akin to the previous PS Vita game from the series, Hyperdimension Neptunia Re;Birth 1, this game also utilises the battle system from Hyperdimension Neptunia Victory in addition to a "remake system" which unlocks special modifications to the game.

The original version received mixed reviews. It received an aggregated score of 53/100 on Metacritic based on 16 reviews.

RPGFan said they found Hyperdiemsnion Neptunia mk2 superior to its predecessor in almost every aspect but still found it lacking in many areas. While they found the gameplay to be decent, they criticized the graphics, dialogue, humour, optimization, and level, quest, and enemy design. They also called out the game for sexualizing child characters and including child characters in sexual situations. They gave the game an overall score of 60/100.