We opened a brand new Ceaco puzzle snd started separating the border pieces from the interior pieces. Many pieces were stuck together... not like it had been worked before, but in that they had not been completely through to separate it. To separate those clumps of pieces, would tear the backing off. Stay away and do not purchase. I have never reviewed a puzzle in my 56 years of life, but this was beyond frustrating! We were working a ton of puzzles during our Coronavirus quarantine and this really put more of a damper on an already stressful situation.