Step 1:
Prefold in half two times.

Step 6:
Tape or glue these edges together, see arrows. Then turn the model again

Step 5:
Fold / pull the four corners inwards.

Step 2:
Valley-fold over these four lines.

Step 4:
Prefold over these four lines, then turn the model.

Step 3:
Fold over these four lines.

Step 10:
Valley-fold.

Step 8:
Valley-fold over these two lines.

Step 9:
Prefold, then turn the model

Step 7:
Make five of these X-blocks for one game.

Step 16:
Mountain-fold over the blue line, then press the flap downwards, see arrow.
Use tape or glue to make the top of the block flat.

Step 15:
Repeat step 14 over these lines.

Step 12:
Prefold in half.

Step 11:
Valley-fold.

Step 14:
Fold the edge on the left downwards.
Make the same folds on the place indicated by the pink arrow.
Then mountain-fold over the white line.

Step 13:
Prefold both edges to the centerline, then turn the model.

Step 21:
Press both edges sidewards, see arrows

Step 19:
Prefold, all three parts are the same size.

Step 20:
Pull / fold both edges upwards

Step 18:
This paper is for the rack.
Prefold, all three parts are the same size.

Step 17:
Make five 0-blocks for one game.

Step 22:
Repeat steps 20 and 21 with these two edges.

Step 25:
Fold / pull these two edges upwards again

Step 26:
Fold / pull these six edges upwards.

Step 24:
Fold / pull the four corners inwards.

Step 23:
Fold over these four lines.

Step 27:
Tape / glue all edges together, see arrows as example.