Jogo da Velha

Classic 3×3 tic-tac-toe with original grove artwork. X starts; alternate placing one mark in an empty clearing. Three aligned marks horizontally, vertically or diagonally win; a full board without a line draws.

One human against a labeled perfect minimax bot, exactly two local humans, or exactly two signed-in online humans. Choose X or O in solo; the bot uses the same legal rules. Separate selection and placement, winning-line preview, hints, solo Undo, rematch, original synthesis and English/Portuguese Help.

Online: replay-validated public board, sixty-second turns, host-managed casual unverified results. Help stays live; departure/background/connection loss ends without a result. No reconnect or host migration. Portrait recommended; landscape supported. Native display modes preserve the board and seat.

• Arrows/WASD choose a clearing; Enter/Space places one mark
• Mouse/touch: select a clearing, then use Place below the board
• Tab visits controls; F1 opens Help; Escape closes Help or pauses solo/local
• Hint selects without placing; Backspace or Undo restores your last solo decision
• M mutes. Portrait recommended; landscape supported. Online Help stays live.