Setup. Two players, two pen colors. The ball starts on the center dot.
Move. On your turn, draw one line from the ball to a neighboring dot — straight or diagonal, one square long.
No reuse. A line can never be drawn twice, and you can’t travel along the border.
Bounce. If your line ends on a dot that already has a line through it — or on the border — you immediately move again. Chain bounces to sprint across the pitch.
Score. Put the ball into your opponent’s goal to win. An own goal counts for your opponent.
Stuck? No legal move on your turn means you lose.
The solid move ends on a dot that already carries a line, so the same player bounces and moves again (dashed).