This is a new implementation of the standard Jigsaw Race Bonus activity with three new pictures. You have a total of 30 opportunities to complete each of the 3 puzzles as quickly as you can, dragging pieces where they belong.
Completing puzzles earns you rewards:
If you complete each of the 3 puzzles you can join the field-wide rankings to earn further rewards at the end of the event:
I honestly don't know how people do these puzzles so quickly - my combined scores are usually terrible.