logic puzzles

[jd123]

I am looking for websites that have math logic puzzles. I want find find word problems that will use logical reasoning, work backward strategies, etc. Perhaps something with an algebra focus, so the students will learn to write and solve algebra equations.
Thanks!

[Aliceacc]

Here's my favorite site for logic puzzles:
http://www.braingle.com/Logic-Grid.html

I like the fact that they're rated as to difficulty, and that they include the grid.

[Upsadaisy]

I love this place:

www.coolmath.com

[vsimpkins]

I love plexers to use with students.

http://myfunteacher.com/plexers.htm

[DizneeTeachR]

http://teacher.scholastic.com/maven/

We've done these...