The phrase "ninja stars" refers to a weapon used by ninjas, which are small and sharp throwing stars.
Sentences with «ninja stars»
You must constantly tap the A button to move your character and the other buttons perform actions which jump, duck and throw ninja stars at the obstacles. (gamergeddon.com)
When playing solo, you can use the touch screen to slide ninja stars at targets that appear on your TV. (tomsguide.com)
Do you prefer to fight with ninja stars or laser guns? (gameological.com)