i love Tower Defense games but i didn't think i'd like this one. Boy was i wrong. i love, love, love this game. You hire heroes and those heroes are walls (it's a mazing game). Heroes belong to groups (assassins, scouts, bounty hunters, etc.) and if you get a certain amount you get bonuses (e.g., 4 bounty hunters = bonus cash on kill). There are a variety of attacks (tidal wave pushes everyone back) and abilities (scouts don't have to be placed on the map) and powerups (the dog statue makes neighbors attack better). It's really polished and a lot of fun.