It's a small puzzle so be prepared for that. If you're looking for a main 10x10 and want to speed-solve, this isn't the one for you. But if you're like me and just want a 10x10 for the collection, this is a great deal and a very functional puzzle. The puzzle only locked up once in my entire first solve, which took about 1.5 hours to finish. it does take a little aligning, but for such a small puzzle and with so many pieces, that should be expected.