Quatro em Linha

Four in a Row on an original seven-column, six-row gravity board. Click or tap a column on the board to drop directly, or select with A/D/arrows and press Space/Enter. A token lands in the lowest free cell. Four horizontally, vertically or diagonally wins; a full board without four draws. Full columns, out-of-turn actions and moves after the finish are refused. The seeded first player is visible.

Solo plays one human against a bounded public-board search bot. Hint searches the position, selects a column and never drops for you. Solo-only Undo returns to before your last move and the bot response. Ten tactical puzzles ask for an immediate winning drop and count hits and misses. Local play is exactly two humans taking turns, without unilateral Undo.

Online is exactly two signed-in humans. Move histories are replay-validated, with match epoch, sequence and legal turn checks. A 30-second turn clock forfeits. Results are casual and host-managed, unverified. Backgrounding or connection loss aborts without a result; there is no ranked anti-cheat, live reconnect or host migration. Help keeps online play live.

Display-sized board geometry keeps circular tokens proportional to the whole board on desktop, mobile and fullscreen. The engine redraws changes and falling tokens while fixed updates and networking remain active. Original synthesized audio, familiar keyboard controls and direct board mouse/touch actions and English/Brazilian Portuguese help.

• Solo/online: A/D or Left/Right select; Space/Enter/Numpad Enter drops on the initial press; F is an alias; H selects a hint
• Local Blue: A/D, Space/F and H; local Coral: Left/Right, Enter/Numpad Enter and Right Shift
• Mouse/touch: click or tap a legal column on the board to drop directly; numbered native buttons select for the separate Drop button
• U undoes in solo only when offered; Escape/P pauses and resumes solo/local; Escape closes Help first; M mutes; F1 opens Help
• Canceled contacts, repeat, native focus, IME and browser modifiers never drop; portrait recommended, landscape supported