El Shaddai: Zero Nine Reversi is a board video game developed and published by crim.

About

Zero Nine Reversi is a board game that puts a bold twist on classic Reversi. Every stone has HP.

The game includes two ways to play: “Classic,” a deep single-player challenge, and “Online,” where you pick a character and battle other players.

Classic

In normal Reversi, flipping a stone is the end of the story. In Zero Nine Reversi, a flipped stone loses 1 HP. When its HP reaches zero, the stone is purified and vanishes from the board. This simple change turns every match into a battle of attrition, where positioning, timing, and resource management matter as much as territory.

Classic features include:

• HP-Based Reversi – Stones have 0 to 9 HP. Flipped stones grow weaker and eventually vanish. Every move ripples across the board.
• More Than 40 Stories – Earn Rank Points to unlock the stories of angels and fallen angels, complete with original character art and movies.
• Multiple Board Sizes – From the compact 6×6 Mini to classic 8×8 Reversi and the cross-shaped 12×12 Annexation.
• Special Rules – Game-changing rules such as Solo Enoch, Metatron’s Wave, and Gariel’s Light.
• Five AI Difficulty Levels – From EASY to DEATH. The top-level AI punishes every mistake.
• Daily Challenge – A new challenge every 12 hours, with a fixed board, HP, and rules.
• Online Rankings – Compete with players worldwide on a rating system shared across all platforms.
• A Rich Story World – Set in the world of El Shaddai, featuring beloved characters such as Enoch, Lucifel, and Michael.
• Keyboard and Mouse Support – Full support for arrow-key board navigation and stone previews on mouse hover.

Online

A versus mode where you choose a character and fight. On top of stone HP, it adds the “BUMP & BURST” rules and a unique ability for each character.

Online features include:

• BUMP & BURST – When you flip a stone, its HP drops by your character’s attack power (ATK). A stone whose HP hits 0 bursts and frees up its square. A single move can turn the tables.
• Over 40 Characters – Each has their own HP, attack power, and unique ability. Charged, automatic, conditional and more—each ability type changes how you fight.
• Online Battles – Take on players around the world in Random Match, or invite friends with a room code. Your record and ranking are saved.
• Team Battle – A two-versus-two, four-player mode. Work with your ally to take control of the board.
• Play Offline Too – Battle the CPU, play two-player on the same screen, or play Team Battle. Choose an 8×8, 10×10, or 12×12 board.
• Archive – Spend the Gold you earn in battle to unlock characters, titles, effects, and backgrounds.
• Daily Challenge – Complete daily tasks to earn points and claim rewards.