Octopuses are enemies in Aqua Boy.
Octopuses are dark blue-purple with a white spot above one of their black eyes. Four tentacles are visible to the player, which extend from its dome-shaped body into little nodes.
Octopuses are among the first enemies to be encountered in the game. Several often appear within a level at a time, swimming in the same formation. All octopuses move either in a constant horizontal or vertical direction, turning when they reach a certain point. As they move their tentacles to propel their motion, they flash white before pausing and swimming back in the opposite way.
Upon contact, octopuses subtract half a heart of health from Aqua Boy in Normal difficulty and one whole heart in Hard. Nevertheless, octopuses can still be killed with a single, concentrated pistol blast.