Before starting, players must create a river with all river tiles.
The game is played by turns. Each player must play a Movement (At the end of the movement, if any player has a Port card matching the port the boat just stop in, they may discard that card to draw a Scoring 2 points) or Restriction card in order to disturb another player's movement (If a player cannot play any card, they must flip one of their Anchor tokens over, losing 3 points).
The game ends when a player loses their 3 anchors or the last Scoring token is drawn. The player with the most points is the winner.