Play G Arms: Operation Gundam (Japan edition · Japanese) Online

G-Arms: Operation Gundam sends a small mobile suit through overhead battlefields, building the destruction score required to clear each stage. A melee weapon and a ranged weapon give different answers to an enemy's approach, while nearby Gacha bases let you resupply or change machines. A suit reduced to an escape capsule still has a short chance to retreat and recover, so the way back to a base matters as much as the next target. Destroy the enemy's capsule too if you want the encounter to count, and keep a route open before committing to another close-range attack.

Start solo and read the stage's required destruction score. Use B at a safe distance, finish the enemy's capsule and retreat to a nearby Gacha base before damage leaves you exposed. Try another machine there, then return to building the score rather than waiting for enemies to stop appearing.