Logic puzzles

My online gaming world just got much more interesting.

And much more geeky.

I've learned about The Hardest Logic Puzzle Ever. Awesome.

And, in the same vein (but less superlative), here's a site full of Knights and Knaves puzzles (Knights can only tell the truth, Knaves can only lie, and you can only ask yes-no questions. Can you tell which is which?)

Here's another logic puzzle site I frequent. It doesn't have story-based puzzles, but it does have plenty of sudokus and other interesting grid-based logic puzzles.

(Thanks to commenter Berenike for pointing me to Agent Intellect, who links to the above games here. Agent Intellect's blog is intriguing in its own right too.)