Super Robot Taisen OG Saga: Endless Frontier List of the playable main units at the player's command. The overseas versions feature the same character roster as the original Japanese version. Over 90 characters (allies and enemies, not counting event-only characters) are included in the game. You can help Capcom Database by expanding it. Project X Zone has a total of fifteen 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 'Cross Active Battle System', where pressing the A button in combination with the Circle Pad performs up to five basic attack combos. Unlike Namco x Capcom, units can move freely within their range on the field map, without penalty for accessing treasure chests or destructible objects prior to attacking.

Each friendly unit is made up of two characters (referred as 'Pair Unit'), though a third character (referred as 'Solo Unit') can be added for once-per-battle assistance.

The stage takes place in grid-based locations from the game's crossover titles.

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