You’ll need to play the Hidden Object Scene associated with a sector multiple times to “complete” it.
There’s a limited amount of time to complete the sector. You can jam in as many rounds during this time as you possibly can.
Once all the clues in a sector have been found, you’ve successfully completed that sector.
Keep an eye out for the time remaining (and your Badge balance) when completing a sector.
More often than not, you’ll start off with more than enough time, but you may not have enough Badges to finish a sector.
Image caption: (1) Badge balance available (2) Badges needed per play (3) Time available to play