Paper soccer — rules

• The ball starts on the centre point. P1 attacks the top goal, P2 the bottom goal. Starting player alternates each game.
• A move draws a line from the ball to one of its 8 neighbouring points (straight or diagonal).
• A line can never be drawn twice (in either direction), and you can't move along the border. Diagonals may cross.
• The goal line between the posts is open: the ball may cross or run along it.
• Bounce: if the ball lands on a point that was already touched (any border point, post or corner, or the end of an earlier line), you move again. Chains can be as long as you like.
• Goal: reaching the opponent's goal wins; reaching your own goal loses.
• Blocked: if you must move and have no legal move (for example, stuck in a corner), you lose.
• Chess clock (optional): 2:00 each, +4 s after each of your turns. Run out of time and you lose.

Controls

• Tap or click a highlighted point. Filled targets give an extra move.
• Keys: QWE / AD / ZXC around S, or numpad 789 / 46 / 123.
• Arrow keys move straight. For diagonals hold Shift (or Alt) and press two arrows, for example ↑ then →.
• Backspace or Ctrl/⌘ Z undoes one move.

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