Instructions
Go up the stairs to the upper area of the Room of Requirement to reach the four doors holding the missions for each of the game's years. The doors for the later years open only after you have completed the previous year. For example, if you want to access the door for the fourth year, you need to complete all of the missions for the previous three years.
Tap the stylus on the touch screen to select any of the four doors, access that area and leave the Room of Requirement.
Go downstairs to reach the viewing area for the Mini-Kit models, the store where you can buy new characters and other extras, or the character customization area.