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None of the following puzzles has a trick answer, or unwarranted assumptions. They are arranged approximately in order of difficulty; the first few can be done by elementary school children, but they may need to be taught how to think. I tried to include a wide variety of types of puzzles, so that each would teach a new lesson in finding creative solutions by breaking a variety of kinds of mental blocks. Moreover, most of them can be solved mentally by using a judicious point of view.

This is a nice collection of math and logic puzzles.  Some familiar classics as well as some not so well-known.

Create crossword puzzles.

"This archive is designed as a resource for enriching your math courses and nurturing your interest and talent in mathematics! Each Math Fun Fact is a math puzzle or short article that contains a cool mathematics idea. You'll can learn about the mathematics of things like card shuffling to poker to computer vision to fractals to music, just to name a few. This makes great enrichment material for gifted math students or problem-solving groups."

This site is a free resource maintained by Jefferson Lab in Newport News, VA.  It contains resources, lessons, activities, games, puzzles, etc. for teachers and students.

Create your own or use a pre-made one. They can be printed or embedded it into your site to be completed online.

Great resource containing an archive of the weekly Puzzler as heard on NPR's "Car Talk".