英雄誓約HERO ALLIN is a free game developed by IClockwork Limited for iPhone. This game is set in the world of "瑟拉瑞亞," where the guardian gods have fallen and desire has corrupted them. Players take on the role of adventurers who must stop the undead heroes controlled by evil gods. Guided by Athena, they face impending war and must save the world from tragedy.

The game combines Western deities and Eastern legends, allowing players to summon mythological heroes and form contracts with them. It introduces a unique gameplay mechanic by combining heroes with elements from playing cards, such as wild cards, hearts, and spades. Players can strengthen their heroes' bonds through various card combinations.

英雄誓約HERO ALLIN also offers an idle gameplay feature, allowing players to progress even when offline. Players can set their heroes on expeditions and resource gathering, with automatic skill activation. The game also includes challenging dungeon gameplay with Roguelike elements outside the main city walls.

In addition to team competitions, poker camp competitions, and cross-server glory competitions, the game offers special PvP modes like Ace Showdown and Brawl Chess. These modes break the traditional gameplay through the BP segment, providing a unique experience in the pinnacle championship cup.

Please note that the game is rated for players aged 15 and above according to the game software classification management regulations. It offers in-game purchases of virtual currency and items. Players are advised to be mindful of their game time to avoid excessive play. The game contains violence, including bloody scenes of attacks, depictions of tobacco and alcohol use, and characters wearing clothing with prominent sexual features. For any inquiries, players can contact the game's customer service through the appropriate channels.