Instructions
Defeating Clock Tower with Paint
Move back and forth with the Wii-mote's joystick to avoid Clock Tower's slapping hands. They'll slam down on the ground and do serious damage if they come down upon Mickey. Watch the shadows on the ground to know where the hands will slam down.
Paint the Clock Tower's hands with paint by pressing the "B" button. The painted hand will lower slowly once you've completely painted it. Jump onto the hand and wait for it to go back up again, which will bring you to the Clock Tower's face.
Paint the Clock Tower's face when you get close enough. This will defeat the boss and give you the "good" ending.
Defeating Clock Tower with Thinner
Avoid the slamming hands by watching the shadows and moving out of their way when they come to a stop. Jump to avoid the resulting shockwaves, which will damage Mickey if they touch him.
Spray the hands with paint thinner using the "Z" button when they come to a temporary stop after slamming down. The thinner will wear away at the paint, revealing robotic innards.
Continue spraying both hands until they are completely stripped. Clock Tower will slam down on the ground again, but this time the hands will shatter.
Repeat Steps Two and Three, but focus on the arms. The Clock Tower will groan in defeat once you destroy its arms with paint thinner.