Spanning an unprecedented 70 Gundam titles at launch — from the original Mobile Suit Gundam through newer entries like The Witch from Mercury and GQuuuuuuX — the game features over 500 collectible mobile suits and their corresponding pilots for players to acquire. Units span five rarity tiers from N to UR, with UR-class machines serving as the pinnacle of any roster. The main story mode faithfully recreates key moments and iconic battles from 10 core Gundam series, allowing players to relive classic scenes while unlocking unit blueprints through progression. Beyond the campaign, additional PvE modes including Eternal Road high-difficulty challenges, Master League, Tower of Generations, and limited-time events provide consistent post-launch content refreshes. A seasonal manga adaptation published in Gundam Ace magazine further expands the game's storytelling footprint.

Combat unfolds on grid-based maps through classic turn-based tactical battles, where players deploy squads of up to six units with one support character. Unit placement, terrain adaptation, and skill timing are essential — flying and aquatic maps demand careful roster planning to avoid mobility penalties. The development system lets players evolve their machines along branching upgrade paths by spending capital and materials on unlocked blueprints, while reaching milestones in each series' development tree reveals hidden units.

SD Gundam G Generation: Eternal is the latest installment in Bandai Namco’s long-running G Generation tactical strategy series, now fully optimized for mobile platforms. Launching globally in April 2025, it brings the signature chibi-style SD Gundam aesthetic to smartphones, offering both longtime fans and newcomers a chance to dive deep into the sprawling Gundam multiverse.