Reversi Othello, Duel

Reversi Othello, Duel is built entirely around a single flipping mechanic: sandwich a line of your opponent's discs between two of your own color, and every disc in that line flips to your side. The strategic depth comes from how that simple rule plays out over a full board — corner squares can never be flipped once claimed, so fighting for corner control, and avoiding moves that hand your opponent an easy path to one, matters far more than simply flipping the most discs early. Board position, not disc count, decides most games, which surprises a lot of new players expecting a straightforward numbers race. It's a fast two-player strategy game that rewards thinking two or three moves ahead about what you're setting your opponent up to do next, and it's free to play in the browser with no download needed.