Starweb (or StarWeb) is a closed-end, space-based, play-by-mail (PBM) game. First published by Flying Buffalo Inc. in 1975, it was the company's second PBM game after Nuclear Destruction, the game that started the PBM industry in 1970. Players today can choose a postal mail or email format. Fifteen players per game assume one of six available roles and explore and conquer planets within a universe comprising 225 worlds. The object of the game is to attain a predetermined number of points which are generated by various actions during gameplay. Multiple game variants are available. Starweb is still available for play as of 2021 through the company Rick Loomis PBM Games.
Starweb has received numerous reviews from the 1970s to the 21st century with positive and negative comments. Reviewer and game designer Timothy B. Brown stated in 1990 that "StarWeb is arguably the best-loved, most widely known play-by-mail game in history," and the editor of Flagship magazine said in 2009 that it was "one of the best turn-based games ever". PBM game lengths are usually longer, depending on a number of factors. Turnaround time is how long a player has to prepare and submit "orders" (moves and changes to make in the game) and the company has to process them and send back turn results. The average turnaround time in the 1980s was two weeks, but some modern PBM games are play-by-email (PBEM) with shorter turnaround times of twice per week or faster.