Stamps

Each Day, when you complete a puzzle, you will be able to place a Stamp on the calendar. This stamp shows you have completed a day, and if you have stamped it then you can repeat a day's puzzles to get a beter score for all days in the last 3 months.

When you start the game, you will have a basic PokéBall stamp but over time you can unlock even more stamps. This can be done by completing quests in Think Town, or by achieving certain milestones for collecting plush, or playing for certain amount of days.