El Shaddai: Zero Nine Reversi has added an online mode, with the Steam version releasing on November 9. The Steam store page lists the release date as November 8 (showing November 9 in some time zones), resulting in a one-day discrepancy across different sources.
This update adds online multiplayer for up to four players, supporting both random matchmaking and friend invites via room codes. The online mode introduces the "BUMP & BURST" mechanic on top of traditional Reversi rules: when a piece is flipped, it loses HP based on the opponent character's attack power. Pieces with zero HP are removed from the board, turning static territory control into a dynamic battle of attrition. The game features over 40 playable characters, each with unique HP, attack power, and special abilities. Online modes include 1v1, 2v2 team battles, and four-player free-for-all.
The Steam version is priced at $3.99, with a 10% launch discount bringing it down to approximately $3.59 for the first two weeks, until November 15. The PC version supports Windows and macOS, with interface languages including Simplified Chinese, Traditional Chinese, Japanese, English, and three others.
The game originally launched on mobile platforms in April 2026 using a free-to-play model with ads, while the Steam version is a premium buy-to-play title. The single-player "Classic" mode remains a standalone experience, featuring over 40 unlockable stories, various board sizes ranging from 6x6 to 12x12, and "Special Rules" options that alter gameplay. For players familiar with the world of El Shaddai, the differentiated character abilities in online mode are the main highlight distinguishing this spin-off from standard Reversi.