Mushroom stones, or wave stones, are limestone boulders undercut by water.
 These take the form of solitary sentinels of limestone which still bear the unmistakable marks of long-continued erosion by lapping waves at the edge of lakes which have since vanished or retreated.
 These stones are sometimes shaped like mushrooms, others have an overhang facing in just one direction, but all are notched and undercut in such a fashion as to suggest prolonged exposure to standing water at some time in the past.
 The mushroom-shaped stones are produced where the notching forms a fairly even circle around the stone.
Multiverse: Exploring Poul Anderson's Worlds is a gedenkschrift honoring science fiction and fantasy author Poul Anderson, in the form of an anthology of short stories and tributes edited by Greg Bear and Gardner Dozois.
 The book also includes cover art and interior illustrations by Bob Eggleton.
 It was first published in hardcover in May 2014 by Subterranean Press, with simultaneous paperback and ebook editions issued in June 2015 by Baen Books.
 All but one of the pieces are original to the anthology; the remaining one, Tad Williams's "Three Lilies and Three Leopards (And a Participation Ribbon in Science)", was originally published in the Winter 2012 issue of the ejournal "Subterreanean Online".
The Beyonder is a fictional cosmic entity appearing in American comic books published by Marvel Comics.
 Created by writer Jim Shooter and artist Mike Zeck, the Beyonder first appeared in "Secret Wars" #1 (May 1984) as an unseen, nearly omnipotent being who kidnapped the heroes and villains of the Marvel Universe and had them do battle on another planet called Battleworld.
 He later appeared in a more antagonistic role in the 1985 sequel "Secret Wars II", in which he took human form, and threatened to destroy the Marvel multiverse.
 Although he first took on a physical, humanoid form in "Secret Wars II" #2, it was in "Secret Wars II" #3 that he took on the permanent form in which he remained for the rest of his existence, that of a Caucasian human male with curly black hair.
 Although the character met his demise at the end of "Secret Wars II", he has subsequently appeared in stories well into the 2000s, although in greatly diminished form.
Missing Links and Secret Histories: A Selection of Wikipedia Entries from Across the Known Multiverse is a 2013 collection of short stories in the form of fictitious Wikipedia entries.
 The speculative fiction anthology was edited by L. Timmel Duchamp.
 The collection was published by Aqueduct Press, who issued a call for materials in 2011 asking writers to create "wikipedia-page-style entries".
SolarQuest is a space-age real estate trading board game published in 1985 and developed by Valen Brost, after his having conceived the idea in 1976.
 The game is patterned after "Monopoly" but replaces pewter tokens with rocketships and hotels with metallic fuel stations.
 Players travel around the sun acquiring planet, moon, and man-made space structure monopolies while fending off attacks.
 They seek to knock their opponents out of the game through bankruptcy, as well as optional laser blasts and dwindling fuel supplies (when using the Advanced Play ruleset).
Straja Țării (Romanian - roughly, "The Sentinel of the Motherland"; also known as Străjeria - translatable as "The Sentinel") was a youth organization in the Kingdom of Romania, created in 1935 by King Carol II to counter the growing influence the Iron Guard had over the youth of Romania.
 Its members were known as "străjeri" ("sentinels"), and used a form of the Roman salute as greeting.
Sentinels of the Multiverse is a designer card game published by Greater Than Games and released at Gen Con 2011.
 It is a cooperative game in which players control a team of comic book-style heroes battling a villain.
 Each player controls one or more heroes, while a villain and environment deck each run themselves.
 A given game includes 3 to 5 heroes, 1 villain and 1 environment, which can be mixed and matched to create a number of different scenarios.
 The core game comes with 10 heroes, 4 villains, and 4 environments.
Sentinels of the Multiverse: The Video Game is a 2014 video game developed and published by Handelabra Games.
 It is an adaptation of the board game of the same name.
 The game was released for iOS and Android on October 15, 2014 and for Steam on December 22, 2014.
Polydeism (from Greek "πολλοί" (" 'poloi' "), meaning 'many', and Latin "deus" meaning god) is a polytheistic form of deism encompassing the belief that the universe was the collective creation of multiple gods, each of whom created a piece of the universe or multiverse and then ceased to intervene in its evolution.
 This concept addresses an apparent contradiction in deism, that a monotheistic god created the universe, but now expresses no apparent interest in it, by supposing that if the universe is the construct of many gods, none of them would have an interest in the universe as a whole.
Silent Hill: Downpour (サイレントヒル ダウンプア , Sairento Hiru Daunpua ) is a survival horror video game developed by Vatra Games and published by Konami Digital Entertainment.
 The eighth installment in the "Silent Hill" video game series, "Downpour" was released in March 2012.
 Set in the series' multiverse, which consists of reality and an alternate dimension whose form is based on the series' eponymous fictitious American town, "Silent Hill: Downpour" centers on Murphy Pendleton, a prisoner who enters the town, periodically entering the alternate dimension, and unlocks personal repressed memories.
 The game uses a third-person view and can be played in 3D.

Question: What form of entertainment are both Solarquest and Sentinels of the Multiverse?
Answer: game