Zenbound
It's very hard to categorize Zenbound - is it a game? A toy? A puzzle? What it is for sure is an absolutely beautiful and unique creation. Take some rope. Wrap it around one of 51 three-dimensional animals, and try to cover 80% of the thing's surface area. There's really nothing else like it, and it's one of those things that gets people talking when they see you playing it. Buy it at the App Store.
FieldRunners
Tower defense games are one of the strongest genres in the web game market right now, so it's unsurprising that a few have made it to the iPhone. If you're unfamiliar with the concept, hordes of enemies are making their way to your base, and you need to place defensive emplacements to fight them back. FieldRunners is one of the best of the batch, available not only on the iPhone but also the DS, PSP and PS3. Buy it at the App Store.
geoDefense Swarm
Another popular tower defense entry is geoDefense Swarm. Unlike the first geoDefense game, where the enemies travel a set path, gDS lets them roam freely across the playing field, requiring you to use your defenses to build walls and routes for the enemy to be herded into their destruction. Awesome vector graphics and special effects are just the cherry on top of the sundae. Buy it at the App Store.
