as many of you know i love ''TD'' games. a TD is a Tower Defense, in this new version, place your towers in spots that you think will most likely kill all the creeps and keep them from stealing your gems. if you lose one gem no big deal, but don't lose them all or GAME OVER... when you kill a boss you can spend points on upgrades. i suggest buying one gem per boss and keep the rest of your points available to use to put the gems back in their place.