Gomoku

Gomoku with exact-five rules on an original open 15×15 grid; Blue moves first. Alternate a stone on an empty cell. Exactly five continuous stones in any straight direction wins; overlines are legal but do not win. Full board without five draws. Declared casual free opening, no Swap2/Renju bans or tournament equivalence.

One human versus a same-rule threat-aware bot; exact local/online two humans. Legal selection preview and separate placement, cursor/zoom, native responsive board, bounded artwork, original sound, English/Portuguese help, solo Undo and rematch.

Online public histories replay-validated, 60-second turn forfeit and acknowledged terminal result. Casual host-managed outcomes unverified; departure/background/deadline safely aborts. No reconnect/host migration. Portrait preferred; landscape supported.

• Initial WASD/arrows select; Initial Space/Enter/Numpad Enter places at the first press; F is an alias
• Mouse/touch: completed click/tap on a legal point places directly; invalid/forbidden points 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, modifiers and held keys preserve ordinary behavior; canceled contacts/lifecycle changes never place
• Portrait preferred; landscape supported; controls remain outside the board