This is PuzzleBang 2013.
A few years ago, two UIUC undergrads (Benjamin Juang, David Tan) enjoyed an annual event called PuzzleCrack during the ACM R|P conferences. They found they really liked solving puzzles and when they discovered that there wasn't going to be a PuzzleCrack for ACM R|P 2011, they decided they would try their hand at running their own puzzle contest.
PuzzleBang 2011 was pretty awesome, PuzzleBang 2012 got better (in terms of prizes, anyhow), so David and Ben are back to entertain you again this year! This time, there'll be more prizes, better puzzles (hopefully), and more fun!
tl;dr: Here be puzzles. Fun is mandatory. If you're not having fun, please tell us!