The enemies are getting smarter and smarter these days. No longer are they following a set trail heading right for your kingdom. Oh no, this time they are coming from below. Thankfully your kingdom is even sneakier and has found out their plan ahead of time in this free defense game for Android and iOS!

Egypt got you down? Zombies trashing your tulips in the Wild West? We've got some help for you in our strategy guide for Plants vs Zombies 2, Popcap's popular free-to-play tower defense game for iOS and Android!

When Lunalie's mentor goes missing, she sets off to rescue them, along with cards she can use to summon in powerful units like knights, rogues, mages and more to help protect her in this gorgeous and challenging blend of real-time strategy and tower defense from Kurechii for Android and iOS!

The Doodles are coming! The Doodles are coming! Defend your paper kingdom from the invading undead in this lane-based tower defense game. Although its setup looks familiar, this game places a big emphasis on upgrading your units and exploring their different abilities! Stop giant zombies, prisons with legs, and angry tanks from ruining your day. Take back your inky domain!

In Bloons Monkey City you go behind the scenes to train, upgrade, and build a city for your monkey army to inhabit all while working toward one goal: Retake your land from the evil Bloons. Use your tower defense skills to fight back the enemy all while managing your town in order to grow your forces.

Ironhide Games is back for more with the third installment in their wildly popular realtime strategy/tower defense game series available for iOS and Android. As gorgeous and charming as you'd expect, Origins doesn't do much to shake up the established formula, but with new enemies, locations, heroes, and more, it's everything fans enjoy with a high coat of polish.

Save the monster from waves of baddies in this innovative tower defense game. Place towers, then rotate the board to control the layout of the paths. Choose and upgrade your towers wisely to take out even the toughest of enemies.

The hit browser tower defense comes to iOS in this fabulous port. Defend your gems from greedy heroes by placing and upgrading towers full of evil minions and upgrade your spells and abilities. Subtly enhanced and tweaked for iPhone and iPad play, this is a port to be proud of.

It's good to be bad in this gorgeous and funny little tower defense game for iOS or Android where you must place traps to fend off the heroes trying to rescue the Princess... after all, you're trying to harvest her screams! Pay for it outright, or go "free-to-slay", but the most surprising thing might be how UNobnoxious Castle Doombad's free version actually is.

Tower defense games on mobile devices are about as common as ice in an igloo. That's why SMG Studio decided to go all-out with OTTTD. And by "all-out" we mean they crammed in everything they could think of to create a defense game that really is over the top. You'll like it, though, because all of those elements work together to add excitement and depth to a genre that desperately needs a rousing punch in the gut.

The adorable and addictive strategic tower defense hit is now available in delicious iOS flavour! You've kidnapped the kids of Fairyland, and now you must defend them until you can get them to your boss. With all new upgrades, abilities, levels, and an improved balance and UI, this is one mobile game that shines.

Kingdom Rush has returned! Ironhide Game Studio has released an official sequel to the tower defense game that stole our free time (and social lives) back in 2011. Kingdom Rush Frontiers is built on the same basic defense skeleton that made the first game so spectacular, only now there's more of it! It's Kingdom Rush, and you know it's going to be amazing, so get to playing!

CastleMine from Mugshot Games combines tower defense with a little bit of old fashioned digging. Instead of mapping out mazes for creeps to crawl through or building balloon things on green green grass, you get to dig underground one block at a time. Uncover extra gold deposits, additional resources, or even nests of enemies as you attempt to defend your castle from the threat from below.

This barbecue is being crashed by some seriously unruly lizards of the prehistoric sort! Most gophers would turn tail, but you're not giving up your delicious steaks without a fight! Plan strategically and make use of a variety of clever tower types to defend your 'cue against incoming dinos of all sorts, ranging from hordes of sprightly compys to enormous bosses in this indie defense game.

Something has gone terribly, horribly awry at Don Eduardo's zoo. Flesh-seeking undead animals are on the loose and you, plucky boy or girl, are the last line of defense in Zoombies: Animales de la Muerte!, a mobile line-drawing defense game from High Voltage Software. Could this be the worst field trip ever?

Block Fortress is Minecraft meets tower defense meets first person shooter, all squeezed down into a mobile game. Build a base in the middle of a blocky wilderness, place turrets and towers and power supplies to fortify your position, then send in the waves of enemies. Once combat begins, you shift from building mode to combat mode, taking a gun into battle and watching over your fort by blasting enemies by hand. It's incredibly exciting and also deeply rooted in upgrades and tactics, making it the sort of game you can play for months without truly mastering.

Calling all heroes! It's up to you to defend the castles of the kingdom in Wild Heroes. In this tower defense game you must place your heroes wisely to keep the enemy at bay. Upgrade them to wild status to really do some damage. Show the monsters what a hero is really capable of!

Not sure you were aware of this, but balloons have some friends that appear to be a thorn in the side for the world's monkey population: bloons. The bloons never diminish in number no matter how many bloons-related games are released, and the air-filled fiends are still going strong in Ninjakiwi's Bloons Tower Defense 5 for iOS devices. In this tower defense strategy game, it's time for you to prove that you paid just enough attention in history class to know how to place troops but not enough to hinder your gaming expertise!

You've got a few minutes before you have to be at work. That means it's time for a game! But what to play, Pac-Man or a tower defense game? How about both? From Tametick, the creator of Cardinal Quest, comes Pakkuman's Defense, a surprisingly superb melding of the classic arcade game Pac-Man and a modern tower defense game. There are ghosts. There are dots to eat. There are towers to place. And yes, you're going to have a blast with this unusual hybrid!

The tower defense genre has been around for years, punctuated every so often by the release of a game that sets a new standard for how things should be. One of the first for the browser world was Desktop Tower Defense, and for the mobile market, an early heavy-hitter was the original Fieldrunners. Developer Subatomic Studios took a few years to do it, but the team has finally rolled out a worthy sequel with Fieldrunners 2. Expect more maps, more variety, more units, more enemies, and more rewards with this stunning release that will rewrite the way you think of the tower defense genre on iPhone.

Hey there strategy and tower defense fans! Just a little note to announce a bit of good news for iPhone and iPod Touch owners. Kingdom Rush, the so-awesome-it's-mega-awesome tower defense game from Ironhide Games, has finally made its way to small-screened iOS devices, following Kingdom Rush HD for iPad and the browser version of Kingdom Rush last year. The game stands out as one of the best defense/strategy game on the planet, capturing two awards in our Best of 2011 feature, including Best Browser Defense or Strategy game along with Game of the Year! If you haven't tried it in one of its incarnations, you owe it to yourself to correct that mistake immediately!

Your sacred grove is being desecrated! Evil spirits once again threaten the balance of a peaceful woods in Bloom Defenders, and it's up to your green thumb to stop them. This charming tower defense title by Juicy Beast has sprouted up out of your browser and is now available on your mobile device! Five varieties of tree-towers are at your disposal across 36 levels of simple, challenging strategy action.

Hexage, creator of Evac and Everlands, pits your human military prowess against endless alien swarm in this mobile tower defense game, Radiant Defense. Defense of your spiral reactor (which looks oddly like a stove burner) is the number one priority since it keeps out those pesky invaders from, you know, destroying all humans. Radiant Defense definitely keeps elements that you would always expect from the tower defense genre, but you remove the predetermined path and get the ability to create the path they will follow to their doom (hopefully). Lasers will fly, aliens will die, and the entire time your fingers will be nimbly working to hold off a rather comically bad invasion story unfold.

Don't you just hate it when a bunch of brutes, nerds, bullies, and ten feet tall Greeks show up at your party unannounced? Party Crashers Tower Defense plays on that most basic fear humans have shared since the invention of chips and dip. You've only got so much food, so it's your job to defend the party from invading party crashers!

When you hear the phrase "the best things come in small packages", you should mentally amend that to "the best things come in small cube packages". Cubemen is a no-bloat tower defense game that tries to do one thing and do that one thing well: strategy. Forget mini-games, artificially inflated campaigns, and storylines that make about as much sense as a koala flight attendant. Cubemen delivers pure, raw tower defense strategy, and it does it so well, you'll lose yourself each time you play.

New to the iPad world is the tower defense game we all love to love, Kingdom Rush HD from Ironhide Games, a port of Kingdom Rush for browsers released not too long ago. The team had a bit of a problem when an unauthorized clone appeared on the iTunes App Store weeks before release. The knockoff was spotted and eventually removed (whew), leaving space for this excellent port of an already excellent game to wow and surprise gamers in the iOS device realm!