The best 3D brain teaser puzzles require logic and spatial awareness to make an exciting game of skill. From Kanoodle to Hanayama, here are the good ones.

The best 3D brain teaser puzzles require logic and spatial awareness to make an exciting game of skill. From Kanoodle to Hanayama, here are the good ones.

And as you'll see, we've included not just more difficult brain teasers that are great for grown-ups, but also plenty of easier, kid-friendly puzzles and math riddles.