A black billiard ball is trapped in a multi-level maze in Fill the Maze. He rolled in there by accident, but getting out is not so easy. You need to go through all the levels and each labyrinth. The ball must roll along all the corridors, and so that you do not get confused, it will leave a colored trail behind it. You can move the ball along already painted paths, but this does not eliminate the danger of ending up in a dead end. The fact is that the ball can move in a straight line and only a wall can stop it. The ball is not able to stop somewhere halfway, and this should be taken into account when mentally plotting the future route in Fill the Maze.