Unexpensive

You can get a game using materials that can be obtained at any bazaar or chinese store:

A small wooden box, set of sticks, poliexpan balls, cardboard-pen plate, wood drill, wood glue and acrylic paint (two colors).

Begin by sticking the lid of the box with a drill of the same diameter than the sticks. Make the 11 holes according to the template that can be downloaded and printed on paper. Then a rectangle of the same size as the inside of the box is cut into the cardboard .It is placed under the lid, and the same holes are made by passing the drill bit through the holes made in the wooden lid.

Glue some pieces of cardboard pen below the rectangle to separate it from the base of the box, and then add these pieces to the base of the box. Check that the sticks can be inserted from above in each hole, till the bottom of the box (crossing the holes in the rectangle) and that they are straight. If they aren´t, try to rectify or redo the rectangle.

To cut chopsticks, the box lid is used as a rule. Start with the shortlest stick, which must reach the bottom of the box and look a littel bit out of the lid.

Then, cut the longest stick , so that the distance between them is equal to the separation between the three holes which are farther apart (as in the picture).

Check that the large stick fits inside the box, if not, it is necessary to cut both large and small to the same extent.

Afterwards, the rest of the sticks are cut, taking into account that the size of the jumps between them is equal to the separation between holes on the box.

Check that the sticks form the tetrahedron and the lines between them are straight.

Stick polispan balls (it is best to use a pin, wire or a thin tip by heating it with a candle and trying to adapt the hole to the tip of the chopsticks (if they are too sharp, you should toss them a little).

Check that all the balls fit in the chopsticks, and that all the pieces fit into the box.