The Hardhat Beetle is a reoccurring enemy featured in many of the 2D Legend of Zelda titles.
A Link to the PastTower of Hera atop of Death Mountain. These slow moving creatures have a lot of armor, causing Link to ricochet back after he hits one of these enemies with his Fighter's Sword. When there are holes in the floor or other enemies nearby, Hardhat Beetles can be quite the obstacle, as the ricochet can send Link down a hole or right into another enemy.
There are two forms of Hardhat Beetles, although they are nearly identical to one another. The sole difference is that the Red Hardhat Beetles have significantly more health and will take more damage to defeat. The standard Blue Hardhat Beetle can be defeated with three strikes from the Fighter's Sword, while the Red Hardhat Beetle will take an outrageous sixteen sword slashes to defeat.
To avoid the ricochet threat, Link can attack Hardhat Beetles in a number of different ways. Link can use Bombs or the Hookshot to temporarily stun them, making it much safer to deliver a sword slash.
Hardhat Beetles are giant armored insects that constantly run towards you. Hardhat Beetles are always found in rooms with holes in the floor. The easiest way to get rid of these annoyances is to push them back with your sword, into the holes on the ground. Your boomerang and Hookshot will freeze a Hardhat Beetle, which might make it easier to defeat them. The only weapon that can actually harm it is the bombs, but it can be hard to line up an attack since they're always moving.
Oracle of Seasons
These enemies are extremely annoying, as there are only two ways to get rid of them. The first way is to repeatedly whack them with your sword until they fall into a pit. The second way, while much easier, cannot be used as often. It consists of pulling one of the magnetic N balls towards you, and wacking them with it. This strategy is actually required in areas with no pits handy. They can be annoying in groups, as they don't stop coming towards you. Avoiding them is the best way to deal with them, but often times you must kill them to open up doors, which can be rather bothersome.
Oracle of Ages
Since these enemies are invincible, trying to use any weapon as means to defeat them by just hitting them is simply pointless. The only way to get rid of these pesky, constantly persisting enemies is to repeatedly whack them with your sword until they fall into a pit. They can be annoying in groups, as they don't stop coming towards you. Avoiding them is the best way to deal with them, but often times you must knock them into pits to open up doors, which can be rather bothersome.