Online IQ Game 

Really not a game, but a very nicely implemented IQ test. Most tests have a time limit to finish the test; this one is split into discrete modules which can be taken completely separately, which is nice - who has a full, uninterrupted half an hour to do something online?

At first I was irritated by how many interruptions I had doing this, but then I figured that the IQ I get from this test is actually more indicative of my mental state these days, with little sleep and constant interruptions...

pretty hard, I had IQ of 128, taken with grain of salt. =) I was tricked because it doesn't tell you if your answer was correct or wrong until the end.