Step 1:
The papers for the blocks are 15x15 centimetres and the paper for the playboard is 19x19 centimetres.
Prefold in half and cut into half along the prefolded line.

Step 6:
Fold over the prefolded line

Step 5:
Fold the edges to the centerline and unfold the model. All three different blocks are prefolded the same way.

Step 2:
Prefold in half over both lines.

Step 4:
Fold the edges to the centerline

Step 3:
Prefold the edges to the centerline

Step 10:
Pull into a straight angle

Step 8:
Fold over the prefolded lines

Step 9:
Fold both halfs into a straight angle.

Step 7:
Fold over the prefolded lines

Step 16:
Make four blocks like this one.

Step 15:
Repeat step 14 on these two corners.

Step 12:
Turn the model.

Step 11:
Press flat, see arrow.

Step 14:
Fold both corners inwards, use tape or glue.

Step 13:
Pull the upper layer into a straight angle without making new folding lines.

Step 21:
Pull into a straight angle and press the upper part of the model flat (the same as in step 11)

Step 19:
Fold over the prefolded lines.

Step 20:
Fold both halfs into a straight angle.

Step 18:
Fold over the prefolded lines.

Step 17:
Fold over the prefolded lines.

Step 22:
This part is pressed flat, turn the model

Step 28:
Make two blocks like this one

Step 25:
Make four blocks like this one.

Step 26:
Fold over the three prefolded lines.

Step 24:
Fold the four corners inwards, use tape or glue.

Step 23:
Pull the upper layer into a straight angle without making new folding lines.

Step 29:
Prefold the paper for the playboard.

Step 27:
Fold the four corners inwards, use tape or glue.

Step 30:
Fold the edges to the centerline.

Step 31:
Fold the edges to the centerline, then unfold the model.

Step 32:
Repeat step 30 and 31 in this direction.

Step 33:
Prefold all four edges in three parts of the same size, see purple lines as example for one edge.

Step 35:
Press the edges against each other

Step 34:
Fold the corners inwards.

Step 36:
Fold this corner downwards.
Repeat step 35 and 36 on the other three corners

Step 37:
Mountain-fold the four flaps backwards, see purple lines.

Step 38:
Fold the edges straight downwards, use glue or tape.