Shark Sword : At half power, Finn will pull out the sword and it will bite. At full power, Finn will run back and forth with the sword out.
Big Legs : At half power, Finn's legs will grow and he will harm nearby enemies with one single stomp. At full power, Finn's legs will grow huge and Jake's legs will turn into a bird, you can use the arrow keys to walk around, squashing all enemies in your path.
Fear Feaster :(Note: This ability will only work at full power.) Finn will unleash the Fear Feaster which will turn into an octopus-like monster which defeats all enemies on the screen for a short time.