Reversi

Reversi: classic 8×8 disc strategy on an original board. Place a legal disc and flip all directly bracketed opposing lines. Blue starts; sides without moves pass automatically. When neither side can move, more occupied discs wins; equal counts draw.

One human faces a bounded corner/mobility-aware strategy bot. Exactly two local humans take turns; exactly two signed-in online humans share a replay-validated public board. Online turns have a sixty-second deadline; results are casual host-managed and unverified. No reconnect or host migration.

Select and inspect legal flips before separate placement. Native responsive scene, bounded artwork, cursor zoom, original synthesis, English/Portuguese Help, solo Undo and rematch. Portrait preferred; landscape supported.

• Initial WASD/arrows select; Initial Space/Enter/Numpad Enter places at the first press; F is an alias
• Mouse/touch: a completed click/tap on a marked legal cell places directly; illegal cells only preview
• Local Blue: WASD/Space/F/H; Coral: arrows/Enter/Numpad Enter/Right Shift
• H plans a hint without placing; U undoes solo; Z zooms; native Place remains available
• Escape closes Help first; Escape/P pauses/resumes solo/local; M mutes; F1 opens Help; online Help stays live
• Native focus, IME, browser modifiers and held keys preserve ordinary behavior; canceled contacts/lifecycle changes never place
• Portrait preferred; landscape supported; controls stay outside the board