The Enhanced Edition followed in 2012, including tokens in the box and making several balance changes to the rules to scale appropriately to the number of heroes.

He had been playing various comic-book related games, but found that most of them were based on having just two characters directly engaging each other, and wanted instead one "about people with different abilities and different outlooks getting together to beat an overwhelming threat in a weird environment".

Badell worked on creating a fictional comic-book universe inspired by the long histories developed by both DC and Marvel Comics.

Badell crafted a timeline of stories that would be published in the fictional "Sentinel Comics" imprint label, enabling him to develop characters and write the flavor text for each card.

[1] The initial set featured five heroes inspired by the Avengers, and with characters representing amalgams of established superheroes, such as Legacy blending aspects of both Superman and Captain America.

[1] This also led to variations on heroes reflecting comics' frequent shifting of alliances, with most of the same powers but subtly different effects.

[1] Sentinels of the Multiverse has been well received by players and critics since its launch, with Tom Vasel of The Dice Tower podcast giving it the #1 slot in his "top 30 games to look out for from Gen Con 2011",[2] and the review blog Giant Fire Breathing Robot awarding it "Board Game of the Year: 2011".

[3] Reviewers generally praised the art and gameplay, while criticizing the small box, lack of HP trackers, and difficulty scaling among different numbers of players.

The villains in Rook City also include an H icon in some cards, which represents the number of heroes in the game, as a way to improve difficulty scaling.

Similar to Rook City and Infernal Relics, this expansion added 2 heroes, 4 villains, and 2 environments to the game.

The Vengeance box included an advertisement for an upcoming expansion, Wrath of the Cosmos, later released in January 2015.

[16] Critical reception for Sentinels of the Multiverse has been mostly positive and the game holds a rating of 78/100 on Metacritic, based on 5 reviews.

[13][17] Conor Lorenz of Gizorama gave particular attention to the auto-save function which saves the current battle if the iPad closes down for whatever reason.

[18] Andrew Fretz of TouchArcade says that "The app is solidly constructed" but "I don't think there is much meaningful strategy in the game.

He noted that "a lack of information in some parts of the game" may make it hard for new players to keep track of everything happening.

[20] Greater Than Games planned to rerelease all existing Sentinels of the Multiverse content across a core box and five expansions.