Combine a Bomb and a Cutterpower-up to arm Kirby with a short-range throwing star that explodes on impact.”
— Description • Nintendo Power (Volume #134)
Explosive Ninja Stars is a Power Combo. Kirby gets it by mixing Cutter with Bomb. Kirby throws an explosive shuriken, hence the name.
When the ability is used, Kirby throws it from behind him, over his head, and when it reaches his front side, it disappears. It then appears on the first object, enemy or wall, straight in front of where Kirby threw it. It will flash and then explode. All this happens in one to two seconds depending on the distance. In water, the entire process slows down to half the speed, including the period of time the shuriken vanishes.
When the shuriken comes in contact with an enemy, the enemy will remain motionless until the shuriken explodes, which happens rather quickly.
Kirby throws his shuriken, the shuriken becomes embedded in the first solid object (wall, block or enemy) it hits. After about two seconds, the bomb explodes.