If you sat down with me for a game design chat, I'd probably recommend two ideas be crossed right off the list of possibilities: anything too reminiscent of "Minesweeper," and zombies. However, Frogtoss Games had an extraordinary insight -- what about combining the two? It turns out that the result is kind of awesome.
Wanted: artillery commander to stop land-hoarding megalomaniac. Shortage of manpower requires doubling as an engineer during off-hours. Should your brain survive, compensation will include Game Center bragging rights and a Multiplayer Mode that's pretty darn good.