With four levels of difficulty, this online jigsaw puzzle is a great brain-teaser for students of any age.

Students click on all the things that look wildly out of place in this classroom scene.

Kids must compose a square from smaller shapes in this tangram game.

Kids must piece together this artsy puzzle, featuring painter Floyd and his muse.

It's a number conga line! Kids flex cognitive skills and learn numbers with this puzzle.

Puzzles are a great way to work on math skills like shapes and organizing -- and this online puzzle is a great tool for kids of all ages and skill levels.