The objective of Ultimate Crab Battle is to defeat the evil King Crab.
Move Up: Up Arrow Key
Move down: Down Arrow Key
Move left: Left Arrow Key
Move Right: Right Arrow Key
The attacks are the same in each difficulty level, but they do more damage on harder difficulties. Learn how to avoid the attacks in Easy mode before trying Medium or Hard mode. You won't take damage if you touch the King Crab, so you can move around the whole screen to dodge attacks.