Pilot a fighter through vertically scrolling stages, shoot enemy waves, collect power-ups and medals, and use bombs against dense attacks. The rank system adjusts difficulty from player actions, which makes the balance between powering up and keeping rank manageable central to the game. The regional label identifies the ROM set.

Learn the original set bullet presentation and keep a controlled weapon level while practicing routes. Collect only the resources you can use safely, conserve bombs for dense patterns, and avoid comparing scores across revisions without recording the exact ROM name. Build familiarity with one ship before learning the others.