-What is Mosaic R? Mosaic R (reverse) is a type of puzzle that has both mosaic art and original art. You can decide to complete the illustration you prefer and you can change it depending on your mood. 【スペック】 Puzzle Pieces: 500 Large Pieces Finished Size: 510 x 735mm Compatible Panel: No.10-T Material: Paper Including: Puzzle glue, glue spatula