A tray puzzle has a hard, durable board that acts as a place to store the puzzle, as well as a guideline for assembly. When the thick puzzle pieces are removed from the tray, a finished image can be seen printed on the tray. This helps people to see where the puzzle pieces should be placed. A tray puzzle's pieces fit securely within the frame making it a great travel activity. The puzzle can also be assembled without the puzzle board tray for more of a challenge. Seniors and kids alike both enjoy this fun puzzling activity! Recommended for ages 3+