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About this game

"Eternal Tic-Tac-Toe" is a single-player strategy board game that adds piece size, lifespan, overwriting, and MP skills to the familiar 3x3 tic-tac-toe game.

[A Tic-Tac-Toe Game That Requires Thinking Beyond Placement]

Each player can maintain up to 3 regular pieces on the board.

Placing a 4th piece removes the oldest target piece, and a hidden piece underneath may be restored.

Completed lines collapse due to pieces disappearing.

Hidden pieces return, leading to unexpected victories.

Since the winner is determined after all board actions are complete, it's crucial to consider not only the immediate move but also the remaining board state.

[Overwriting with 3 Sizes]

Pieces come in three sizes: large, medium, and small.

Larger pieces can be stacked on top of smaller opponent pieces to capture spaces.

However, when a piece on top disappears, the hidden piece underneath is restored to its original state.

You need to consider not only the visible board but also the moves hidden beneath.


【Three Skills Using MP】

* Shield: Temporarily protects a designated square from overwriting and disappearance due to lifespan.

* Life Extension: Treats a designated normally placed piece as the most recent piece, delaying its disappearance.

* Rotation: Moves the 8 outermost squares of the board clockwise, changing the entire board layout.

The key to victory lies in how you use your MP—protection, life extension, and board transformation—each turn.

【Accumulating Battle Records】

Results against the CPU, win rate, winning streak, shortest victory, tactical records, and the history of the last 20 battles are saved on your device.

You can earn a new title after achieving 24 accomplishments.

You can choose your favorite title from those you've earned and display it as your player title.

This is a strategic board game packed with deep strategic gameplay created by disappearance, restoration, overwriting, and rotation, all playable on a 3x3 board in short bursts of time.


Eternal Tic-Tac-Toe is a single-player strategy board game that expands the familiar 3×3 formula with piece sizes, lifespans, stacking, and MP-powered skills.

[Think Beyond the Move]

Each player can keep only three normally placed pieces in play.

Place a fourth piece and the oldest eligible piece expires, potentially revealing a piece hidden underneath.

A completed line can disappear.
A returning piece can unexpectedly decide the match.

Victory is checked only after every board effect has resolved, so winning requires you to think beyond your next move and predict the board that will remain.

[Cover Pieces with Three Sizes]

Pieces come in Large, Medium, and Small sizes.

A larger piece can cover a smaller enemy piece and take control of its space.

However, when the top piece expires, the covered piece returns exactly as it was. You must read both the visible board and the moves waiting underneath it.

[Use Three MP Skills]

・Shield
Temporarily protects a space from being covered or removed by expiration.

・Extend Life
Moves one of your normally placed pieces to the back of the expiration order.

・Rotate
Shifts the eight outer spaces clockwise and transforms the entire board.

MP increases each turn. Choosing whether to defend, delay an expiration, or change the board can completely alter the outcome.

【Build Your Record】

Track your results against the CPU, win rate, winning streaks, fastest fastest, tactical statistics, and 20 most recent matches.

Complete 24 achievements to unlock new titles, then choose an unlocked title to display.

A compact 3×3 board becomes a layered contest of timing, memory, and strategy through expiration, restoration, stacking, and rotation.

What’s new

初版リリース