Robo-squid

"Danger! Mutant robot squid attack! Watch out for the cannonballs that this behemonth fires at you. Type the letter on the cannonballs to send them flying back at him" -Hint box The Robo-squid is the penultimate boss encountered in Typer Shark! Deluxe, as well as in Typer Shark Abyss. It attacks the Diver using a barrage of cannonballs. Though the boss cannot be harmed directly, typing the letters on the cannonballs can reflect them back into the enemy, dealing damage. It is the third boss encountered in both games and will attack at either Level 11 in Adventure Mode or 3000 feet in Abyss Mode.

Trivia

 * Though the Robo-squid is not the final boss of the game, coming before the Ghost Ship, it is sometimes considered to be the hardest boss since its slim hitbox allows it to dodge cannonballs.