Sunrider: Mask of Arcadius is the second installment in the Sunrider saga. Having held off the advancing PACT fleet at the battle of Far Port, captain Shields and the Sunrider proceeds together with the Solar Alliance fleet to strike back against PACT on their own turf and take on their mysterious masked leader Arcadius himself.
The gameplay is a mixture of visual novel and turn-based strategy, where the player mainly controls the Sunrider ship itself and its small crew of "Ryder" mechs. Winning battles is rewarded with money - used for upgrading the Sunrider and Ryders - and command points - used to issue special orders during battle.
Mask of Arcadius includes the entirety of Sunrider: First Arrival, and the episodes can either be played seamlessly back to back, or you can choose to start with Mask of Arcadius. Compared to the prevous installment, Mask of Arcadius brings a revamped hex-based battle system and a skirmish mode for practicing.