|Artwork of Hari Harry from Mega Man 3.|
When a Hari Harry spawns, it will first fire two barrages of five needles, with each of the five needles traveling in different directions. One needle travels horizontally left, one horizontally right, one diagonally left, one diagonally right, and one vertically upwards.
After firing its two barrages of five needles, it will roll towards the player for a few seconds, where it is invulnerable to most damage until it stops rolling. It will fall straight down if it rolls off a platform. Once it finishes rolling, it will fire one barrage of five needles; after doing so, it will roll towards the player for a few seconds again. Its behavior will then loop back to the start, firing two barrages of needles again.
Hari Harry can be selected to face either left or right in the Level Builder. However, due to the way its AI functions, its manual facing direction is redundant, having no effect on how the enemy moves or attacks.