Ballblazer is a futuristic sports game created by Lucasfilm Games and published in 1985 by Epyx. Along with Rescue on Fractalus!, it was one of the initial pair of releases from Lucasfilm Games, Ballblazer was developed and first published for the Atari 8-bit computers. The principal creator and programmer was David Levine. The game was called Ballblaster during development; some pirated versions bear this name.

It was ported to the Apple II, ZX Spectrum, Amstrad CPC, Commodore 64, and MSX. Atari 5200 and Atari 7800 ports were published by Atari Corporation. A version for the Famicom was released by Pony Canyon.

Ballblazer is a simple one-on-one sports-style game bearing similarities to basketball and soccer. Each side is represented by a craft called a "rotofoil", which can be controlled by either a human player or a computer-controlled "droid" with ten levels of difficulty. The game allows for human vs. human, human vs. droid, and droid vs. droid matches. The basic objective of the game is to score points by either firing or carrying a floating ball into the opponent's goal. The game takes place on a flat, checkerboard playfield, and each player's half of the screen is presented from a first-person perspective.

A player can gain possession of the ball by running into it, at which point it is held in a force field in front of the craft. The opponent can attempt to knock the ball away from the player using the fire button, and the player in possession of the ball can also fire the ball toward the goal. When a player does not have possession of the ball, his or her rotofoil automatically turns at 90-degree intervals to face the ball, while possessing the ball turns the player toward the opponent's goal. The goalposts move from side to side at each end of the playfield, and as goals are scored, the goal becomes narrower.

Pushing the ball through the goal scores one point, firing the ball through the posts from close range scores two points, and successfully scoring from long range (where the goalposts are not visible) scores three points. The maximum number of total points between the two players is ten, meaning that any points scored that would take the combined total above ten will cause the opponent's score to be reduced by the same amount, resulting in a kind of tug of war scoring system. The game ends when either a player successfully scores ten points or the timer runs out. If time runs out and the score is tied, the game goes into "sudden death", where the first player to score wins.

Ballblazer and Rescue on Fractalus! were the first two games developed by the fledgling Lucasfilm Computer Division Games Group. The Games Group had been established in 1982 on a $1 million funding from Atari, Inc. in exchange for the "right of first refusal" for Atari as publisher.

Both games were developed with the Atari 8-bit computers and Atari 5200 console in mind. The games were ready by March 1984 and were first publicly revealed on a Lucasfilm press conference on May 8. Cartridge versions for the Atari computers and the 5200 were planned to be the released first in the third quarter of 1984, with disk versions for the Commodore 64, IBM PC, and Apple IIc and IIe coming under the Atarisoft label in the fourth quarter of that year. Ballblazer and Rescue on Fractalus! were also scheduled to be released for the then-upcoming Atari 7800 console.

On July 3, Warner Communications sold all assets of the Consumer Division of Atari, Inc. to Jack Tramiel, and the agreement with Lucasfilm fell through. On the Winter Consumer Electronics Show on January 5–8, 1985, with both Ballblazer and Rescue on Fractalus! not yet being released on any platform, Epyx became a distributor for both games, which would be released in disk format for the Atari 8-bit and Commodore 64 computers. The Atari 5200 versions were not part of the distribution deal. Epyx finally published the Atari 8-bit versions of both games by May 1985, and the Commodore 64 version of Ballblazer by September of that year.