What Are Shmups and Bullet Hell? Definition, Subgenres, Classics
Shoot 'em ups explained: what defines them, subgenres from fixed shooters to bullet hell and survivors-likes, and classics from Space Invaders to Touhou.
If you remember dropping a coin into an arcade cabinet and steering a ship through swarms of enemies and bullets, you already know the shoot 'em up. In Japan the genre is called STG, and in English "shoot 'em up" is shortened to shmup.
The shooting games discussed here are a different genre from first-person shooters (FPS). They are arcade-style games viewed from above or from the side, in which you shoot down hordes of enemies while dodging their attacks. In this post, we cover the definition of the shmup, its subgenres from fixed-screen shooters to bullet hell and "survivors-likes," the landmark games in its history, and the design principles that hold the genre up.
Definition and Core Appeal: Shoot, Dodge, Memorize
English Wikipedia defines the shoot 'em up as a subgenre of action games in which the protagonist fights large numbers of enemies by shooting at them while dodging their fire. The player must rely mainly on reaction speed. The view is usually from above or from the side, and the protagonist is often a vehicle such as a spaceship or an aircraft.
The fun of a shmup is simple and intense.
- The thrill of dodging: the tension of slipping through a narrow gap between bullets
- The thrill of growth: weapons that get flashier the more power-ups you collect
- The thrill of memorization and mastery: learning enemy spawn orders and attack patterns so you get a little further each time
- The thrill of scoring: choosing risky play on the same stage for a higher score
Shmups have almost no realistic physics. Your ship changes direction instantly without inertia, and bullets fly in straight lines at constant speed. Because everything is designed as a "readable pattern," every failure becomes information for your next attempt.
Subgenres
Wikipedia mainly divides shmups by perspective and movement.
| Type | Characteristics | Representative games |
|---|---|---|
| Fixed shooter | Movement mostly left and right on a single screen | Space Invaders, Galaxian, Galaga |
| Multidirectional shooter | 360-degree rotation and movement, including twin-stick controls | Asteroids, Robotron: 2084 |
| Vertical scroller | The screen scrolls upward as you progress | Xevious, Raiden, DoDonPachi |
| Horizontal scroller | The screen scrolls sideways as you progress | Defender, Gradius, R-Type |
| Run and gun | A character on foot shoots instead of a ship | Commando, Contra, Metal Slug |
| Rail shooter | Moves into the screen along a fixed path | Space Harrier, Star Fox |
| Cute 'em up | Bright, whimsical worlds and enemies | TwinBee, Fantasy Zone |
| Bullet hell | Bullet patterns that fill the screen, tiny hitboxes | DoDonPachi, Touhou Project, Ikaruga |
| Reverse bullet hell (survivors-like) | Attacks are automatic; the player chooses movement and upgrades | Vampire Survivors |
What Is Bullet Hell?
Danmaku (弾幕) means "curtain of bullets." Bullet hell shooters are defined by intricate bullet patterns that cover the screen, and in exchange they make the ship's hitbox far smaller than its sprite (practically a single point) so you can slip between the bullets. In English the style is called "bullet hell" or "manic shooter."
Landmark Games in History
| Year | Game | Developer | Notes |
|---|---|---|---|
| 1978 | Space Invaders | Taito (Tomohiro Nishikado) | Established enemies that fire back, multiple lives, and the high score |
| 1979 | Galaxian | Namco | Color graphics, enemies diving out of formation |
| 1981 | Defender | Williams Electronics | Bidirectional horizontal scrolling and a radar |
| 1983 | Xevious | Namco | Influential vertical scroller that split air and ground attacks |
| 1985 | Gradius | Konami | The standard horizontal shooter, with a power meter for choosing weapons |
| 1987 | R-Type | Irem | The Force device and slow, strategic pacing |
| 1993 | Batsugun | Toaplan | Considered the starting point of bullet hell |
| 1995 | DonPachi | Cave | Bullet hell with a combo scoring system |
| 2001 | Ikaruga | Treasure | Switch between black and white polarity to absorb same-colored bullets |
| 2002 | The Embodiment of Scarlet Devil | Team Shanghai Alice (ZUN) | Doujin bullet hell; the Windows release grew an overseas fanbase |
| 2022 | Vampire Survivors | poncle | Popularized the auto-attacking "reverse bullet hell" genre |
Stars of the Arcade Golden Age
Taito's Space Invaders (1978) is most often cited as the game that set the genre's template. Earlier shooting games were limited to hitting targets, but Space Invaders was the first in which many enemies fired back at the player, and it popularized the ideas of multiple lives and the high score. From the late 1970s to the early 1980s, shmups were the central genre of the arcade.
Galaxian (1979) showed off color graphics and enemies with distinctive movement, and Xevious (1983) introduced a vertical-scrolling structure in which airborne enemies and ground targets are attacked with different weapons. Konami's Gradius (1985) added strategy with its "power meter," which lets you collect capsules and pick the weapon you want, and Irem's R-Type (1987) won wide acclaim for its slow but dense stages and a device called "the Force."
The Birth of Bullet Hell and the Shift to a Niche Genre
By the mid-1990s, 3D games and fighting games had taken over the arcade, and shmups gradually became a genre for a small group of devoted fans. That is when bullet hell appeared. Toaplan's Batsugun (1993) is considered the starting point, and after Toaplan closed, Cave, a studio founded by former Toaplan developers, carried bullet hell forward with DonPachi in 1995.
Treasure's Ikaruga (2001) drew attention overseas with its original rule of switching the ship between black and white to absorb bullets of the same color. Touhou Project, a doujin series made by a single person, was recognized by Guinness World Records in 2010 as the "most prolific fan-made shooter series."
Design Characteristics
- Patterns and fairness: Enemy behavior is designed to be predictable. Patterns that "you can dodge once you've memorized them," rather than randomness, are what make shmups fair.
- Tiny hitboxes: Bullet hell games treat only part of the ship as its hitbox, letting you pass through gaps between bullets that look impossible.
- Balancing power-ups and risk: Stronger weapons make things easier, but in many games you lose power when shot down, which keeps the tension up.
- Bombs: The emergency tool found in many shmups, which clears every bullet on screen at once, is both a lifeline for beginners and a scoring tool for experts.
- Scoring systems: Mechanics like DonPachi's combos, where taking more risk earns more points, give players a reason to keep playing even after seeing the ending.
- Boss fights: The boss at the end of each stage is the place where the dodging skills you've learned are put to the test.
Who Should Play Them
- People who like short, intense bursts of focus
- People who enjoy seeing their skills clearly improve through repeated practice
- People who want to get lost in dazzling effects and fast music
- People who like score competition or challenges like the "one-credit clear"
If bullet hell feels too hard, you could start with survivors-likes, which focus on choosing and upgrading weapons, or with home ports that let you continue freely.
Shmups Today
Because of its high difficulty, pure bullet hell is still a niche genre. Wikipedia notes that Japanese players hold about 90% of competitive bullet hell records. Yet the genre's elements have actually spread more widely. Bullet dodging has found its way into the combat of RPGs like Undertale and roguelikes like Enter the Gungeon.
In particular, Vampire Survivors (2022) made the "reverse bullet hell" genre hugely popular: the player doesn't shoot directly but attacks automatically, focusing only on movement and upgrade choices amid swarms of enemies. The term "survivors-like" was even coined after the game. In this way, the oldest grammar in games, shooting and dodging, keeps living on in new forms.