Go to http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=297558390&mt=8 It's a free TD game called TapDefense. It has 42 levels, 6 towers to choose from, 7 enemies, and... "halos." I haven't played it yet, but it looks very nice so I thought I'd let everyone here know about it. Now, what are you waiting for? GO DOWNLOAD IT - IT'S FREE! Haha, no need to thank me. Also, post here on what you think about the game once you've started playing.