How to Fold an Origami Waterbomb

Medium level, 20 steps. Traditional. Earliest record: De Kleine Papierwerkers (Van Calcar), 1863.

The animated version shows each fold moving, one step per screen. This page shows every step at once.

All 20 steps

Step 1. Start white side up. Fold the top edge down to the bottom edge.
Step 2. Fold the top left corner down along the diagonal, then unfold.
Step 3. Fold the top right corner down the same way, then unfold.
Step 4. Push the left corner in between the layers along the crease. This is an inside reverse fold.
Step 5. Push the right corner in the same way.
Step 6. Fold the left corner of the front layer up to the top point.
Step 7. Fold the right corner up the same way.
Step 8. Fold the left corner to the center line.
Step 9. Fold the right corner to the center line.
Step 10. Fold the two loose points at the top down.
Step 11. Fold the left point along the edge of the side flap and tuck it into the pocket.
Step 12. Tuck the right point into its pocket the same way.
Step 13. Turn the paper over.
Step 14. Fold the bottom corners of this layer up to the top point too.
Step 15. And the right corner.
Step 16. Fold the left corner to the center line.
Step 17. Fold the right corner to the center line.
Step 18. Fold the two loose points at the top down.
Step 19. Fold the left point along the edge of the side flap and tuck it into the pocket.
Step 20. Tuck the right point into its pocket the same way.
Done. Blow into the hole at the bottom point. The waterbomb puffs up into a cube.