these game mechanics are notably similar to the basic game-play format of Axis and Allies. Risk: The Battle for Medieval England is published in conjunction with English Heritage. It includes cards for special powers and special missions. The game board is a map of England. The object is to become the King of England. If no player wins by a certain point in the game, then all players must retreat. Variants from existing works of science fiction or fantasy Risk: Star Wars Original Trilogy Edition.When playing by the Star Wars Original Trilogy Edition rules, each of the three factions has its own victory condition. The Empire must eliminate all Rebel forces. The Rebel Alliance must find and destroy the Emperor, who will be hidden under one of the Imperial Bases. The Hutts must take control of 10 out of the 13 designated resource planets on the board. The moment one of these victory conditions has been met by the respective faction, the game is over and that faction has won. Risk: Star Trek 50th Anniversary. has a number of rules, cards and units that differ from the original game. the game has "Q cards " in which Q may assign missions to the player. Also, there are location cards providing a specific value for each location. Also, there are cards representing specific crew members, which each have a specific command value. Variants based on concepts from science fiction or fantasy Risk 2210 A.D. has numerous rules which differ from the original game. The board includes water and moon territories. Game units include commanders (land, naval, space, nuclear, diplomat). Players earn and spend "energy" to obtain commanders, cards, and space stations and to activate some command cards. Players can roll an 8-sided die in some instances. Armies are not acquired through card trading. The game is only 5 years (turns) long; the winner is the player with highest score at the end of the last year. Players bid energy to determine turn order rather than following the same order determined by a dice from the beginning of the game. Risk clones by other companies and developers Many variants have been published by other groups or companies, that are based on the original concept of the game of Risk and that contain much of the functionality of the original, but are not licensed by Hasbro, such as the video games Global Domination