SPI's Top Ten Bestsller List, and remained in the Top Ten for the remainder of the year. In 1978, SPI released a larger sequel, Objective Moscow, in which the tables are turned and the Soviet Union is invaded by a coalition composed of NATO, China and Iran. Reception In the April 1976 edition of Airfix Magazine, Bruce Quarrie called it "an intriguing fantasy game based on a set of historical hypotheses." Quarrie liked the aims of the game, saying, "The game is a particularly exciting one, with the US/Canadian player(s) having to try to repel the amphibious assaults from three directions, protect their industrial areas and so on." He concluded that the game was "a novel treatment of a familiar science fiction theme, which should have wide appeal since, in our experience, a large majority of wargamers tend also to be science fiction readers." In his 1977 book The Comprehensive Guide to Board Wargaming, Nicholas Palmer noted, "The hypothesis is fanciful, but it gives an excellent excuse for a modern war fought over a giant multi-coloured map of the continent." Palmer liked the shorter scenarios, saying, "the scenarios have fewer turns than most complex games, so they can be played in 4–6 hours." He noted "Some problems with play balance, as the defence (realistically enough) can maintain almost permanent air superiority by basing their planes well inland." Palmer concluded "The total effect is colourful, complex, and naturally rather abstract." In Issue 16 of The Space Gamer, Tony Van Lien commented that "For those of us who are into holocaust, Invasion: America, by Simulations Publications Inc. is the game we've been waiting for." He called the then-new "untried unit" rule "a simple and very playable system that adds greatly to the feel of the fog of war in the game." Although Van Lien liked the simplicity of the rules, he was disappointed that there was no scenario that involved an invasion force crossing the Bering Strait. He also thought the actual physical size of the map and the large number of counters might be off-putting to a new gamer. Despite these faults, Van Lien concluded on a positive note, saying, ""I:A has appeal for experienced gamers as well as newcomers. It's a truly great game." In the inaugural issue of Ares (March 1980), Eric Goldberg liked the "beautiful" map, and commented that "for a large game, [it] plays quite well." But