Project X Zone

Stages in Project X Zone take place in grid-based locations from the game's many crossover titles. Each friendly unit is made up of two characters (thus referred to as a Pair Unit), though a third character (or "Solo Unit") can be added for once-per-battle assistance. Players can switch between these units to create different tactical combinations. Unlike Namco × Capcom, units can move freely within their range on the field map, with no penalty for accessing treasure chests or destructible objects prior to attacking.

The battle system is called the Cross Active Battle System, wherein pressing the A button in combination with the Circle Pad performs up to five basic attack combos. Additional gameplay elements include Support Attack, which allows the player to call in a nearby ally for assistance, and Cross Hit, which freezes the target in place during simultaneous attacks from multiple units. Also, the player can trigger Critical Hits by connecting their next attack just before the target hits the ground after the first. As the player's units deal damage, the player's Cross Power (XP) gauge fills up and can be used for special attacks and defensive moves on the map. Damage done via Cross Hits can fill this gauge up to 150%.

Mii Kouryuji, the latest descendant of the Kouryuji clan, and her tutor, private detective Kogoro Tenzai search for the Portalstone, the heirloom of the Kouryuji clan. As they investigate the whereabouts of the Portalstone, they team up with a large cast of characters who have been affected by strange portals appearing in their worlds, and fight against villains who have taken opportunity of the chaos caused by the rifts between worlds collapsing.

Namco Bandai came up with the idea of a "dream crossover" and brought on Capcom and Sega. The game was first revealed in a teaser by Bandai Namco on the official website until it was revealed in the April 2012 issue of Famitsu.

The initial creation of the characters were done in 3D character models before they were converted to be SD pixel art. Notable attacks used by the characters had to be done in 2D space in order to preserve its source material origin.

The game sold more than 85,539 units in its first week in Japan. In the West, the game has sold over ten times more than what Bandai Namco had expected. The game was among the 20 best games sold in the United Kingdom after it made its debut. In the United States, the game has been among the best selling games sold for the 3DS. The game has sold over 400,000 copies worldwide, according to Bandai Namco.

Project X Zone has received mixed to positive reviews from western critics. The game currently has a score of 70 out of 100 on Metacritic. IGN's Scott Thompson gave Project X Zone a score of 8 out of 10, saying, "Project X Zone is often funny and consistently frantic – two traits not necessarily associated with tactical RPGs. Its story is confusing and the chapters slavishly follow the same repetitive formula, but the superb battle system makes repetition not just tolerable, but enjoyable."