Xardion (超攻合神サーディオン, Chou Kou Gasshin Sādeion, lit. "Super Attack God Xardion") is an action platformer video game where the player controls robots with different skills in order to defeat the enemy and reach goals.

While possessing the typical qualities of action platformers at the time it was made (jump, duck, shoot etc.), Xardion made use of a few novel elements. Additionally, the game had a role-playing element where experience points could be accrued by defeating enemies and bosses, and each level up increased the player's maximum life and special ability points.

During the game, the player takes control of one of three available robot forms. Each form represents one of the three inhabited worlds in the system: Alcedes, from the Desert Planet; Triton, from the Water Planet, and Panthera, from the Jungle Planet.

Each form has its own particular abilities and weaknesses. For example, Panthera is less than half the height of the others, and as such can enter narrow passages to collect items. Additionally, each form possesses its own health and special ability points, and must be upgraded separately from the others. This is equivalent to a 'tag team' game mechanic, where one heavily-damaged character can be swapped instantly for another.

Eventually, one of the robot forms is replaced by Xardion, which combines the abilities of all three previous forms and exceeds them. Xardion only becomes available near the end of the game, but joins the team at level one. An obstruction that can only be cleared by a sufficiently leveled Xardion forces the player to return to earlier levels in order to gain levels and develop special abilities.

The game also has a couple of different endings depending on how much experience the player gains during the course of the game.