We found this puzzle online and ordered the 100 piece version from Amazon. It is laser cut wood with no indication of where the pieces might go - except for a faint wood grain. Trying to find that first piece was a challenge. After working on it for four days - on and off - successful! We're trying it again, but this time we've rotated it 180 degrees. It now seems harder! It's called a DevilPuzzle and is very well made. There are other versions out there. We may be forced to try the even harder version.
The things we do in isolation!!