5/10 thought not accepting genres for the smooth group (and I now understand why) was a bit exacting. Clever use of the old masters etc, enjoyed very much thank you

Great fun, guessed 3/4 categories straight away but took me a few goes to figure out the red herring

Raphael, Donatello and Michelangelo are all Italian artists as well as being Teenage Mutant Ninja Turtles.

Good wall! But also a bit frustrating that you could swap Michelangelo, Donatello and Raphael around and still get the same solution - ideally there should only be one unique solution, in that it's the only possible way the wall fits together.

papercut?

Excellent.

Far too many false solutions which are all interchangeable to still get the correct groupings.

There shouldn't be multiple solutions.