Join the fight to guard the Earth against an impeding celestial encroachment on human life in Invaders World Tour. Secure the borders of 12 different countries in 60 explosive levels and bonus stages! Unlock mini-games to achieve higher scores to take control of the global leaderboards! 

DEFEND THE WORLD
Countries all over the world have witnessed a surge of extra-terrestrial activity accompanied by the appearance of worm-hole-like portals and slews of strange-looking life-forms. It’s up to you to defend the borders of countries like the United States, Canada, Europe, China, and more! 

PLAY ON THE BIG SCREEN
Now you can connect your iOS device to any television and use your iPhone or iPod touch as a wireless remote! 

PREVAIL
Annihilate the cosmic enemies that are being spewed from the mouth of the monstrous warped portals! The fate of the world, as we know it, is in your hands! 

POWER UP
Pick up massive power-ups and ship upgrades as you work your way from continent to continent! Ammo includes numerous different types of death-dealing missiles and guns. 

ALTERNATE DIMENSIONS
Create your own worm hole or snatch up a Time Ripper, a detonator that rips apart the space-time continuum to take every living creature into another dimension! 

vBOX
Choose from two different sound themes, Modern for the new age gamers, or Retro, for a nostalgic throw-back. Invaders World Tour also features a new, never-before-seen sound-effects generator that allows you to create your own, customized, in-game soundtrack!

PUB MODE
Create the illusion of a stained table top directly on your screen to fool your friends! (iPad Only)

NOTE: iPhones or iPod touches can be wirelessly synced to iPads without connection to television

Source: http://itunes.apple.com/us/app/invaders-world-tour-3/id403754945?mt=8