Cut a square piece of paper
Fold the paper in half diagonally
Unfold it
Fold the other diagonal in half
Unfold it
Fold each corner toward the center
Fold the square in half to make a rectangle
Unfold it
Fold the rectangle in half the other way
Unfold it
Use the crease lines to push the paper inward
Flatten it into a smaller square
Fold the top layer corners toward the center
Flip the paper over
Fold the other side corners toward the center
Tuck and shape the points to form the star
Press all folds firmly to finish the ninja paper star