It moves up/down forward and backward one tentacle at a time. I thought it was pretty obvious. So if no one likes it, then here's a different submission. This time thoroughly detailed.

The Giant Robo Boss With A Huge Spike Ball:


1. Boss appearance:

The Gian Robot falls from the sky and when he lands on the ground, the screen shakes. No weapon can affect the metal body. You can only attack the turtle for a short amount of time (like 3 seconds).

2. The spike ball:

The turtle pulls out a giant spike ball and starts spinning it above his head for 3 seconds. And then he throws it.

3. Ball movement and shield:

Immediately after the turtle throws the ball, a protection shield made of King Kong Glass 5 enclosed the turtle to protect it. Weapons are not effective against it. The ball starts bouncing around and can harm the player. It slows down after each bounce until it eventually stops. However, the player can shoot at the ball. When the ball is shot, it jumps high and gains speed. That way the players must use the spike ball to hit the King Kong Glass 5 to break it. Only the ball can break the glass. The glass takes several hits until it breaks (like 5 or 10).

4. Legs and boots:

If you stay close to the robot, it can smash you with its legs.

5. Teleporting:

Every once in a while the boss teleports in a random predefined location. If it's near the ball, it can kick it.

When you broke the glass, the boss falls down, the turtle will be unconscious and you'll be able to finish it with any weapon.