Screw

Neijī (generically referred to by Nintendo Power as screws ) is an uncommon enemy that can be found in the Mario Zone of Super Mario Land 2: 6 Golden Coins. They are screws that appear only near the end of the zone's first stage. They wind themselves out of the ground and bounce toward Mario to attack, attempting to drill into him from above. They can be defeated by jumping on them or using a fireball.