Rogo is a new math-type puzzle that was invented in 2009.
This video shows how it works:
You can find out more about it here: Rogo website
There is a new puzzle each day here: Daily puzzle
Find out about the iPhone app here: iTunes
Tips and ideas here for mathematics teachers who want to use Rogo: Teaching tips
Explanation of the Operations Research in Rogo here: Rogo and OR.