|Bullet Hell||A sub-genre of shmup where the whole screen is literally filled with projectiles, usually with the main challenge being avoiding those bullets (often by recognizing/memorizing firing patterns) rather than destroying enemies.||1993 / 2019||143 games|
|Multi-directional shooter||A shooter sub-genre defined by open two dimensional environment with freedom of orientation and movement.||1982 / 2019||96 games|
|Run and Gun||Shoot 'em up sub-genre, with both horizontal or vertical scrolling and may feature multidirectional movement.||1980 / 2019||845 games|
|Scrolling shooter||A shooter sub genre characterized by automatically advancing (autoscrolling) environments, both vertically or horizontally.||1980 / 2020||1404 games|
|Tube shooter||Shmup sub-genre where player moves alongside the inside surface of an abstract tube.||1979 / 2016||61 games|
Shoot 'em up
Informal group for finding shmup sub-genres.