The Clapperboard times how long it takes you to complete the puzzle. If you don’t like playing under pressure you have the option to turn off the timer in the Options Menu.

The Reel Reward shows the quality of the shadow you’ve created.
If your shadow doesn’t fill the shadow target or exceeds the border, quality will be deducted. You can complete the puzzle at a Bronze, Silver and Gold level.

When you feel that you are done, yell CUT! And select the Clapperboard. This will end the puzzle. As you complete more puzzles, more objects will be unlocked to use in Free Play mode.