I had a 10,000 piece puzzle once. I used to do it to relax my brain before bed, and when friends visited, we all work on it together. It was a picture of the Twin Towers in NYC (when they still were standing). I had it all finished except for about 1/3 of the sky. There were probably 3000 pieces of sky, and sky is the worst part
We moved, and packed it back into its box. Havenʻt taken it out since, and that was almost 7 years ago
