I'm addicted to this game. It's somewhat like Settlers of Catan, with the following changes:
Big differences:
You steadily score victory points. First to X victory points wins.
You can spend victory points to capture territory form opponents
"Real-time" play, where all players act at once and turns advance every ~5-10 seconds (makes for frantic play, and a VERY different experience)
Other stats:
Online and local play
2-4 players
AI players (make for quick games)
$2 in App Store