I love sudoku its a wonderful game that has a simple concept to it but yet test your analytical and your reasoning abilities I take around 6mins to solve a medium puzzle and 25mins max for a hard problem
I like it because it keeps me busy. Sometimes I hate it when I can't find a number. It's like I've been going in circles, but then I make progress, Yay for me! The fastest one I've done is 3 minutes, I think it was medium.