What are some solid puzzle games on Steam?*

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You could perhaps emulate those Professor Layton games.

All of them are quite wonderful by the way.

Old school?

The Lost Mind of Dr Brain, The Island of Dr Brain, Castle of Dr Brain, Dr Brain Thinking games are quite similar in nature to what you're requesting.

Not on Steam though.

I've heard great things about The Witness which is currently on sale.

Hope you find something. :)