Space Invaders: The Shooter Born from Hardware Limits
How Taito's 1978 Space Invaders was made, why the aliens speed up as they thin out, bunkers and the UFO, Japan's Invader boom, the Atari 2600 port, sequels, and ways to play it today.
Space Invaders is an arcade game in which you move a cannon left and right along the bottom of the screen and shoot rows of descending aliens. It was released in 1978 by Japan's Taito and is regarded as the game that set the template for the fixed shooter genre. Its rules still look very simple today, but many of the ideas it introduced carried straight over into countless later games.
In this post, we focus on Space Invaders alone: what led developer Tomohiro Nishikado to make it, why the aliens move faster as their numbers shrink, and what roles the bunkers and the UFO play. We then cover the "Invader boom" in Japan, the Atari 2600 port, the game's influence on the shooting genre and the next generation of developers, and finally its sequels and the ways you can play it today.
At a Glance
| Item | Details |
|---|---|
| Release | July 1978 in Japanese arcades; November 1978 in North America (distributed by Midway) |
| Developer | Taito; designed by Tomohiro Nishikado |
| Genre | Fixed shooter |
| Hardware | Intel 8080 CPU; colored cellophane over a black-and-white monitor to add color |
| Major ports | Atari 2600 (1980), Famicom (1985), and many other computers and handheld devices |
Tomohiro Nishikado and the Game's Origins
Space Invaders was designed by Tomohiro Nishikado, an engineer born in 1944. At Taito he had already made games such as the racing game Speed Race (1974) and the gunslinger duel game Western Gun (1975). Space Invaders took him about a year, working almost entirely alone on both the game design and the hardware needed to run it.
The starting point was Atari's 1976 game Breakout. Seeing brick-breaking games become hugely popular in Japan in 1977, Nishikado envisioned a game that kept the sense of achievement and tension of destroying targets one by one while adding elements of shooting games. Instead of bouncing a ball to break stationary bricks, the player would fire shots directly at moving enemies.
At first he considered enemies such as tanks, fighter planes, and battleships, but the technology of the time made it hard to depict flying movement naturally. He ruled out human targets because he felt shooting people was inappropriate. Then, prompted by the anime Space Battleship Yamato and the film Star Wars, he settled on a space setting, and he drew octopus-shaped aliens inspired by the novel The War of the Worlds. Squid- and crab-shaped aliens were added, and each character was animated by alternating between two frames.
The game was originally titled Space Monsters, after a song popular in Japan at the time, but his superiors changed it to Space Invaders.
Speed-Up Born from Hardware Limits
Nishikado decided to use a microprocessor for better graphics and smoother movement. He had been impressed by the difference in Gun Fight, Midway's microprocessor remake of his own Western Gun. Using Midway's board as a base and adding his own circuitry, he built custom hardware centered on an Intel 8080 CPU, along with his own development tools. Because almost no products in Japan used microprocessors at the time, he had to study by reading English-language material and attending seminars.
Even with that hardware, he could not achieve everything he wanted. The screen could not display color, and there was not enough power to move the enemies faster. So strips of orange and green cellophane were placed over the black-and-white screen to make some areas appear in color.
The game's signature behavior, in which the aliens get faster as their numbers drop, also came from these limits. While programming, Nishikado discovered that the processor could draw each frame faster when fewer aliens remained on screen. Since the aliens' positions were updated every frame, the more aliens you destroyed, the faster the remaining group moved. Rather than compensate for this speed difference, Nishikado kept it as a rule of the game. As a result, tension naturally peaks when only the last few aliens are left.
The sound followed the same pattern. The repeating four-note bass sound created by sound designer Michiyuki Kamei plays in step with the aliens' march and speeds up as they do. Background audio that plays throughout the game and changes tempo with the situation was later recognized by game music researchers as an important early innovation.
How It Plays: Bunkers and the UFO
A total of 55 aliens appear on screen, in 5 rows of 11. The group moves left and right as one block, dropping down one step each time it reaches the edge of the screen. The player can only move the cannon left and right along the bottom, and only one shot can be on screen at a time. You can't fire again until your shot hits something or disappears, so firing wildly doesn't work.
The aliens fire back. If the cannon is hit, you lose a life, and the game ends when all lives are gone. If the aliens reach the bottom of the screen, the game ends on the spot regardless of how many lives remain. Where earlier arcade games ended a round with a time limit, in Space Invaders the descending aliens themselves serve as the remaining time.
| Element | Role |
|---|---|
| Aliens | Higher rows are worth more points (30, 20, 10) |
| Bunkers | Shields above the cannon; they wear away as they are hit |
| UFO | A craft that occasionally crosses the top of the screen; hitting it gives bonus points |
| Cannon | Moves left and right; fires only one shot at a time |
Above the cannon are four shields called bunkers. At first they block the aliens' shots, but they erode a little with every enemy hit, and the player's own shots fired from beneath them also punch holes. That makes it important to hide behind a bunker and judge when to step out and fire. The idea of cover that breaks apart when hit later became a common element in many shooting games.
Occasionally a UFO crosses the very top of the screen, and hitting it earns bonus points. When you destroy all the aliens, a new group starts one step lower than before, and this cycle continues endlessly. Because the game had no ending, the player's goal became how long they could survive and how high a score they could reach.
After release, players discovered a bug: when the aliens came very close, their shots would not hit the cannon. Taito chose not to fix it again because too many machines were already in operation, and the bug became an established strategy known as "Nagoya shooting."
Japan's Invader Boom
The initial reaction was mixed. Inside Taito, colleagues lined up to play, but management expected low earnings because games ended quickly. Arcade owners were also uninterested at first; instead, pachinko parlors and bowling alleys were the first to bring in the machines.
Within a few months, however, things changed. According to the Japanese Wikipedia, a single machine earned 20,000 to 30,000 yen a day, quickly recouping its price of 460,000 yen, and as orders poured in, Taito granted other companies permission to produce it. By the end of 1978, more than 100,000 machines had been installed in Japan. "Invader houses" filled with nothing but these machines appeared everywhere, and some coffee shops even replaced their tables with table-type cabinets.
The fever also became a social issue. In March 1979, the problem of high school students absorbed in the game during class hours was raised in the House of Representatives Budget Committee, and between April and June of that year many schools banned students from entering game centers. The Japanese Wikipedia also cites a survey showing that, as of July 1, 1979, Invader-type games accounted for 230,000, or 81%, of the 280,000 TV game machines in Japan. It also notes a contemporary commentary reporting that by that summer the craze had already cooled and invader houses had more empty seats.
The well-known story that "Space Invaders caused a shortage of 100-yen coins in Japan" should be treated with care. The Japanese Wikipedia states that the Bank of Japan urgently put more 100-yen coins into circulation, but the English Wikipedia, citing analyses by numismatists, says no such effect can be found in mint records and treats it as an urban legend. Nishikado himself has also expressed skepticism about the story.
The Atari 2600 Port and Worldwide Success
On March 10, 1980, Atari released Space Invaders for its Atari 2600 home console. It was the first officially licensed port of an arcade game to a home console, and because it quadrupled the Atari 2600's sales, it is cited as the first example of a "killer app" that made people buy the console.
Rick Maurer, who handled the port, spent three months trimming the program, originally 7 KB, to fit on a 4 KB cartridge. As a result, the aliens were reduced from 55 to 36 and the bunkers from four to three. In exchange, he added rule variations such as moving shields, zigzagging shots, invisible invaders, and two-player modes. This version sold over 1 million copies in its first year and more than 4.2 million by the end of 1981, making it for a while the best-selling game on the Atari 2600.
That same year, 1980, about 10,000 people took part in a Space Invaders tournament that Atari held in the United States. Media coverage of the event is credited with helping establish video gaming as a mainstream hobby. The arcade version, according to the English Wikipedia, grossed a cumulative $3.8 billion by 1982, making it the highest-grossing entertainment product of its time.
Influence on the Shooting Genre and Developers
After Space Invaders, arcades were flooded with space-themed shooting games. Namco's Galaxian (1979) and Galaga (1981) built on the Space Invaders template while adding new changes and refinements, and each became a major success in its own right. Defender (1981) from Williams, made by Eugene Jarvis, also closely resembled Space Invaders in its early versions before heading in a different direction. The Japanese game magazine Gamest regarded the game as the beginning of the shooting genre, tracing a line from fixed shooters to scrolling shooters such as Gradius.
Elements such as multiple lives, a repeating structure that grows harder, enemies that fire back, and destructible cover spread far beyond the genre. Many people also entered the game industry because of this game. Shigeru Miyamoto has called Space Invaders the most revolutionary game and said it influenced his career path. Pokémon creator Satoshi Tajiri wanted to make a sequel after playing it in junior high school, and Metal Gear's Hideo Kojima named it as the game that first pulled him in. John Romero and John Carmack, the creators of Doom, also cite it as their first encounter with video games.
The alien graphic came to be used as an icon for video games as a whole, and in 2017 it was added to version 10 of the Unicode standard as the "alien monster" emoji. In 2016, the game was inducted into the World Video Game Hall of Fame.
Sequels and Ways to Play Today
Taito went on to release many sequels. Space Invaders Part II, with color graphics and intermissions, came out in 1979, and Return of the Invaders, with more complex enemy movement and attacks, came out in 1985, followed by Super Space Invaders '91, Space Invaders DX, and Space Invaders '95. In 2008 came Space Invaders Extreme (Nintendo DS and PSP), which added musical elements, and Space Invaders Get Even (WiiWare), in which the player controls the aliens. Space Invaders Infinity Gene, released for iPhone in 2009, is built so that the game system itself evolves as you progress.
There are also several ways to play the original today.
- Arcade Archives: In December 2025, Hamster released the original arcade version as the 500th title in this series. It is available in Arcade Archives for Nintendo Switch and PS4, and in Arcade Archives 2 for Nintendo Switch 2, PS5, and Xbox Series X/S.
- Space Invaders Invincible Collection: A compilation released for Nintendo Switch in 2020 to mark the 40th anniversary, including the original and other titles from the series.
- Space Invaders Infinity Gene Evolve: A version released on Apple Arcade in 2025, notable for turning Nagoya shooting into a game system.
The setup of an alien horde slowly closing in while the player holds the line is still used across many genres. Grid Defense, a sci-fi tower defense game about stopping an alien invasion, is another take on that same setup.
