Galac-Tac is a closed-end, science fiction, play-by-mail (PBM) wargame, first published by Phoenix Publications in 1982.

[4][a] Chris Harvey started commercial PBM play afterward in the United Kingdom with a company called ICBM through an agreement with Loomis and Flying Buffalo.

[6] For approximately five years, Flying Buffalo was the single dominant company in the US PBM industry until Schubel & Son entered the field in about 1976 with the human-moderated The Tribes of Crane.

[8] In 1981, some PBM players launched another company, Adventures by Mail, with the "immensely popular" Beyond the Stellar Empire.

Galac-Tac began in 1982 as a closed-end PBM game published by Phoenix Publications in Dallas, TX.

As of November 2021, the game can also be played by postal mail or email for those with no or limited web access, such as military, those in prison, or other cases.

[14] Players begin the game in one of hundreds of star systems within a 100 × 100 grid map with some money—called Production Inventory (PI)—and basic ships.

[18][d] Players expand into other star systems in search of "raw material", or Production Value (PV) which can be sold on return.

Combat is consequential in Galac-Tac, and "[i]n the end, your military might and strategy will determine if you win or lose".

[15] Phil Krauskopf reviewed the game in the January–February 1992 issue of Paper Mayhem, noting a point of attraction was the ability for ship design.

[19] He concluded that Galac-Tac was "quite an enjoyable game" stating that he did not experience the monotony noted by the previous reviewer.

[19] Krauskopf thought that providing star systems with integral defenses would be an improvement and Delta Games suggested this was in the works based on player interest.

[19] Eric Carver reviewed Galac-Tac in the August 2014 to September 2015 issue of Suspense & Decision magazine.