Most times, enemies can be defeated with a single hit per enemy. However, on some upper levels, enemies may require either two or three hits to be defeated. Enemies that require two hits will be wearing either red or purple armor and will display two hearts next to their name. Enemies that require three hits to be defeated will be wearing black armor and will display three hearts next to their name. Enemies that require more than one hit to be defeated will be alerted to the player via the use of a "jump-force" alert audio sound.