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Flank the AI's discs to flip them. Win games in a row — the AI gets tougher each time.
An 8×8 board starts with two black and two white discs in the center. You are black, the AI is white. Black moves first.
Tap a highlighted cell to place a black disc. A move is only legal if it flanks one or more white discs in a straight line (horizontal, vertical, or diagonal) between your new disc and another black disc. All flanked white discs flip to black.
If you have no legal move, your turn is passed automatically. The same applies to the AI. The game ends when the board is full or neither side can move.
Win a game (more discs than the AI) and a new game starts right away — your score is your win streak. The AI searches deeper with every win, so it keeps getting tougher; a loss or draw ends the run.
Goal: win as many games in a row as you can.
Forget grabbing the most discs early; in Reversi a big lead in the midgame often flips against you, and the players who win hold the corners. Corners can never be flipped, so they anchor whole lines for the rest of the game — fight for them, and just as importantly, avoid the squares diagonally next to a corner, because playing there usually hands the corner to your opponent.
The deeper idea is mobility: you want lots of legal moves while starving the opponent of theirs. Counter-intuitively that means staying small and compact in the centre early, taking quiet inside moves rather than gobbling edge discs that expose you. If you can reach a position where the AI has few or no safe replies, it will be forced to give you a corner or a strong edge. Think about the shape you are leaving behind, not the discs you flip this turn.