Instructions
Keep moving and stay close to the spider droid's moving left leg when it first appears to avoid being hit. Don't attempt to hit the spider droid yet, as you won't be able to inflict any harm.
Roll out of the way when the spider droid stomps on the ground. Quickly get close to the leg again.
Move close to the leg when it becomes stuck in the ground. Use your force skills to bury the leg.
Aim at the leg and jump on it. Run partway up the leg.
Double-jump toward the shaft extending from the spider droid's head.
Hit the cannon with your lightsaber.
Repeat this process two more times to defeat the Separatist spider droid.