Notable attacks used by the characters had to be done in 2D space in order to preserve its source material origin. The initial creation of the characters were done in 3D character models before they were converted to be SD pixel art. 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. Namco Bandai came up with the idea of a "dream crossover" and brought on Capcom and Sega.
Chun-Li and Morrigan Aensland from Street Fighter and Darkstalkers.Ryu and Ken Masters from Street Fighter.Dante from Devil May Cry and Demitri Maximoff from Darkstalkers.Chris Redfield and Jill Valentine from Resident Evil ( Biohazard).Reiji Arisu and Xiaomu from Namco × Capcom.Haken Browning and Kaguya Nanbu from Super Robot Taisen OG Saga: Endless Frontier.Soma Schicksal and Alisa Ilinichina Amiella from God Eater.Jin Kazama and Ling Xiaoyu from Tekken.Yuri Lowell and Estellise Sidos Heurassein from Tales of Vesperia.Project X Zone has a total of 15 save game slots included in the game, which can be used for recording a save game file during intermissions with a quick save file and a soft reset command. Damage done via Cross Hits can fill this gauge up to 150%. 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. Also, the player can trigger Critical Hits by connecting their next attack just before the target hits the ground after the first.
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. 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. 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. 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. Stages in Project X Zone take place in grid-based locations from the game's many crossover titles.