TowerMadness has been around for a while now, but the unique challenge and several updates over time make it a must-have for tower defense fans. Featuring 3D graphics that look great on the Retina Display, TowerMadness challenges you to defend a flock of sheep from an onslaught of attacking aliens. You can view the action from above or use a reverse-pinch gesture to zoom in on the action. You'll play on 49 included maps, but you can purchase 28 expansion maps from within the game. A recent update added five more maps, and two new weapon upgrades to add to the replay value.
TowerMadness offers both campaign and endless game modes along with an easy tutorial mode in the beginning to get you comfortable with the gameplay. TowerMadness is a bit different from the other games in this collection in that it is an open-field rather than a fixed-path tower defense game. This means you'll need to place your units in such a way that the enemy will need to navigate around them to reach your flock of sheep. You'll quickly learn that the best strategy is to create a sort of maze with your turrets, forcing enemies to pass by a mix of turrets several times. TowerMadness also includes replays so you can analyze your strategies to see which work the best.
Tower Madness has Game Center support with 29 achievements you can earn. You can also compare your scores with other players' online, giving additional challenge to an already challenging game.
While we continue to enjoy this title, we think the pricing may be a bit steep for a game that's been around as long as it has. The game seems to go through cycles of going on sale and recently was free for a time, so maybe you'll want to wait for the next sale. Still, if you like strategy games and want an incredibly deep tower defense experience, TowerMadness offers plenty to keep you interested.