Any clean and flat surface. (Like Palago.)
Thirty-six diamond-shaped pieces (each diamond is equivalent to two equilateral triangles combined), with twelve of each color blue, red, and orange.
The two players each hold half of the total number of pieces of each color.
- Opening: The first player places a blue piece, and the second player must then place a non-blue piece. After that, the two players take turns placing pieces.
- The pieces on the board must be connected.
- Pieces of the same color must be the same direction, while pieces of different colors must be different direction.
- Blue pieces must be horizontal direction(from the perspective of both players).
- The direction of the red or orange pieces is not initially determined and is established after the first red or orange piece is placed.
- It is prohibited to form areas that cannot be illuminated by external parallel rays.
- After all the pieces are placed, the number of cubes for each player is calculated.
- Each player looks at the blue piece as the "top" of a cube from their own perspective, and the other two colors represent the sides. A cube must consist of three visible faces, including visible and continuously pushable foreground faces.
- The player with more cubes wins.
- If there is a dispute over the fairness of who goes first, the players can switch and play another round.
- If both players win one round each, the total scores will be compared, and the player with a higher score wins. If the total scores are still tied, it will be a draw.
For the example of the first figure: