Sudoku. Especially Sudoku variants. Sometimes I time myself for fun when I get bored. I think Sudoku is quite theraputic in a sense (no, I'm not crazy ). You can solve one in seconds or hours...you can adjust the size - From 4x4 to 18x18. Is Sudoku math-related though?

If we're talking math-related though, I guess Addoku puzzles (a popular, traditional Sudoku puzzle variant).

Yeah, I guess you're right.

http://www.addoku.net/ - Basic guide to Addoku puzzles. When I get the time, I might make a few of my own for people to solve.

I'm into Sudoku as well. Actually, that's the only one I can think of being math related. It's getting pretty big around here, it's in the newspaper and there are particular magazines full with puzzles only.

I have some huge integrated sudoku puzzles which I still need to solve, they take like more than a day to solve each
I've never heard of Addoku though, I will most definitely check it out.

Yeah, MathsIsFun's Sudoku puzzles are quite good. Fun to solve!

Hmm... does the Integration Bee count as a game? It's like a spelling bee, but you integrate. You get a minute and 30 seconds to solve a given integral. It is one of the hottest things I have ever enountered. I've never actually had the chance to be in one, but how could it not be the most enjoyable event? Maybe I'll find one in college hosted by the math department. Until then, I'll practice my integration of obscure and challenging functions. You know, if that advanced board ever gets created, I might make something like an integration bee thread, I even have a list of integrals on this desk here which are perfect for the task. Maybe I could even post this on the Puzzles board. Ok, I'm too excited about all this, I'll stop typing.

You could make Integration Bee it into a timed game ... hard to enter the answer though ... possibly multiple choice?