<b>About the </b><b>500</b><b> Piece Puzzle:</b><br><b>1.</b><b>The Legend </b><b>: </b>A scene about The Prague Astronomical Clock.There is a legend that if the clock were to ever fall into disrepair, then the city will suffer. It was heavily damaged during the Second World War during the Prague uprising against occupying Nazi forces. After significant effort, the machinery was repaired.We hope you will have the imagination of repairing the astronomical clock when playing the puzzle.<br><b>2.Exquisite Production: </b>100% eco-friendly cardboard, less dust, each piece is a unique shape, interlocking puzzle. Adhere to CPSIA, ASTM safety regulations. Puzzle size： 20" x 14.2".<br><b>3.Art Decoration:</b> Designed suitable for mounting. Easy to match the colors of most home design style.<br><br><br><b>Difficulty Levels of Puzzles:</b><br>Level 1: under 300 pieces, colorful, suitable for children between 3-8.<br><b>Level 2: 500-1000 pieces, More </b><b>detail</b><b>s and more regularity</b><b>. </b><b>Used </b><b>for entertainment and relaxation, Suitable for people of all levels, which will not cause players to be frustrated.</b><br>Level 3: 1000-2000 pieces, less color, more challenging, suitable for adults who have more puzzle experience or multiplayer collaboration.<br>Level 4: more than 2000 pieces, more of the same color, suitable for people who are more patient and seeking more challenge.<br>Level 5: puzzles designed for professionals and contestants.<br><b>(The Prague Astronomical Clock puzzle is LV</b><b>2</b><b>)</b><br><br><br><b>After Sale Service:</b><br>We have added a missing pieces inspection procedure before packaging. But if you still find missing, don’t worry, contact us and we will reissue the missing one immediately.