Dai-2-ji Super Robot Taisen α is the third game in the Alpha sub-series after Super Robot Taisen α Gaiden, picking up a few months after the previous story. Earth has successfully repelled the Neo Zeon and Zentradi attacks, but faces ever more new threats, from both inside and out.
Gameplay is the standard mission-based, turn-based strategy that the series is well-known for. Several new systems appear, including a new Platoon system that allows groups of units to work in unison, a damage scaling system where the size of units affects the damage they take from attacks, and the redesigned pilot training system introduced in Original Generation. New series featured in this entry include Brain Powered, Crossbone Gundam, GaoGaiGar, and Steel Jeeg.