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Revolutionary Tower DefenseDANGER! Earth is under attack from a vast armada of flying saucers. Only you can stop the invasion of these relentless alien monsters - don't let a single one through! Get ready for a revolution in tower defense that will send you spinning. Defend the solar system by sending satellites into orbit around planets, moons and space stations. Create the perfect defense by rotating orbits to move your satellites into the best positions. Do you have what it takes to defeat the Gorg and save the solar system? Find out in more than 40 levels of thrilling tower defense action inspired by classic sci-fi films from the 1950s.
iOS · Jan 19, 2012
Worldwide · Exact date · IGDB
Mac · Jan 19, 2012
Worldwide · Exact date · IGDB
PC (Microsoft Windows) · Jan 19, 2012
Worldwide · Exact date · IGDB
Xbox 360 · 2012
Worldwide · Year · IGDB
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30 achievements available.

Complete all challenge chapters
LockedSteam

Completed story chapter 8 on normal difficulty or harder without building a repair station
LockedSteam

Reach wave 25 in Arcade mode
LockedSteam

Complete all story chapters on Hard difficulty
LockedSteam

Get hero medals from all story chapters on Hard difficulty
LockedSteam

Kill 50 enemies with beam link rays
LockedSteam

Reach wave 3 in Arcade mode
LockedSteam

Complete any level on unstoppable difficulty.
LockedSteam

Achieve a total score of 10 000 000 or more
LockedSteam

Complete the first level.
LockedSteam

Check the credits
LockedSteam

Complete all challenge chapters on Hard difficulty
LockedSteam

Finish a level on normal difficulty with 3 x the amount of money needed for the investor medal
LockedSteam

Meet Sereia.
LockedSteam

Reach wave 50 in Arcade mode
LockedSteam

Deploy the Black Hole for the first time.
LockedSteam

Complete all challenge chapters on Unstoppable difficulty
LockedSteam

Defeat a mothership.
LockedSteam

Complete the last level.
LockedSteam

Complete a level using only one satellite type.
LockedSteam

Meet the Radiant Beem.
LockedSteam

Defeat 1000 aliens.
LockedSteam

Achieve hero medals from 5 different story chapters
LockedSteam

Get all the performance medals in one level in a single try.
LockedSteam

Spend more than $15,000 in one level.
LockedSteam

Shoot 10 asteroids
LockedSteam

Get 8 upgrade tokens.
LockedSteam

Achieve hero medal in story chapter 3 on normal difficulty or harder without building a single Blast Cannon
LockedSteam

Complete all story chapters on Unstoppable difficulty
LockedSteam

Get hero medals from all story chapters on Unstoppable difficulty
LockedSteam
Community notes