I've been told that Dice Wars is a bit like a simplified version of Risk, a game that I've never played but always been a bit curious about. Regardless, it's an excellent little time waster if a little tricky to get to grips with initially. The gist is that you roll your dice towers against opponents', and if your roll is higher then you conquer them. Give it a go.
I recommend you start with just 2 players, and only challenge dice towers smaller than your own. k!