A shuriken is the fold that convinces people origami is worth learning. It takes two sheets rather than one, and the trick is that the second sheet gets folded as a mirror image of the first. Stack them crosswise, tuck four points into four flaps, and the star locks together with no adhesive.
This walkthrough follows Paper Kawaii's tutorial. Two colors make the finished star look far better than one, because each half shows through on alternating points. Squares of 15 cm give you a star about 8.5 cm across, which is a good size to hold.
The folds themselves are simple. The only place people go wrong is forgetting to mirror the diagonals on the second unit, at which point the halves refuse to interlock.
What you need
- 2 squares of paper the same size, ideally two colors
- A bone folder or the back of a spoon for sharp creases
- A flat, hard table
Which paper makes the best ninja star?
Origami paper is the easy choice. It comes pre-cut to 15 cm, it is thin enough to take a crisp crease, and it is colored on one side so the two halves are easy to tell apart while you fold.
Printer paper works too. Cut two squares from an A4 or letter sheet. The star comes out stiffer and a little heavier, which some kids prefer for throwing. Sticky notes make tiny stars fast, but the glue strip fights you on the lock. Fold with the sticky edge on the outside of the band.
Why two colors? Each unit ends up showing on two opposite points. In one color the pattern disappears. In two, the star looks like it is spinning even when it is sitting still.
Two-piece star vs the transforming eight-piece star
The star on this page is the classic four-point shuriken from two units. It is the one to learn first. The transforming ninja star uses eight smaller units that slide against each other, so the ring opens into a star and closes again. It is a great second project, but it takes far longer and every unit has to be folded to the same size. Get the two-piece star locking cleanly before you try it.
Throwing it safely
A paper star is light, but a sharp point in an eye is no joke. Throw it at a target: a cardboard box, a paper plate taped to a door, a laundry basket. Never at people or pets. Flick it flat from the wrist like a frisbee, not overhand.
Why won't my ninja star lock?
- The units are not mirror images. This is the number one failure. Set the two Z shapes side by side before stacking. If they look identical, refold the second one with every diagonal running the other way.
- The lock is loose. Points that sit halfway under the flaps pop out when you throw. Push each one further in than feels necessary.
- Soft creases. A band that springs open makes stacking a fight. Run a bone folder over every fold.
- Squares that are not square. Uneven paper gives lopsided blades. Trim printer paper carefully.
More paper folds to try
If you liked this, how to make a paper airplane is the other classic throwing toy. Origami lucky stars are a quick fold for filling a jar, and the origami crane is the next step up in precision.