When you choose to skip a level, Rory enters Rage mode. You can tap any square and Rory will jump to it directly. During this mode, coins will throughout the level. Rage mode will expire when the thermometer is emptied. When this happens, the level will be marked as completed. If you collect all the paintings (or complete the level's goal) while in Rage mode, you will complete the level immediately and lose any Rage mode you had remaining. Instead of working on paintings or meeting the level's goal, so that time to collect coins instead.