The style of the gameplay has been described as "reverse tower defense",[6] "tower attack",[7]and "tower offense".[8] Players control a convoy of vehicles investigating anomalies around sections of a downed alien spacecraft, which are protected by various types of defensive towers that have to be destroyed.[9] Players do not directly control the vehicles in the convoy, rather they set paths for the convoy to follow along city streets, while also dropping power-ups such as decoys or smoke-screens to aid the survival of the convoy. In addition, players can purchase and equip a number of different units with varying offensive and defensive attributes to make up the convoy.
In the Windows, Mac, Linux and XBLA versions, players directly control a soldier on foot (dubbed the Commander) whom they use to pick up and drop the power-ups for the convoy. The iOS and Android versions omit the Commander in lieu of the player directly placing power using the touch-based interface. In addition, the iOS and Android versions do not feature the levels set in Tokyo.
MINIMUM
Windows 98/2000/ME/XP
Pentium III or AMD Athlon 800MHz Processor
256MB RAM
2GB Hard Disk Space
Nvidia TNT2, GeForce 1, 2 or 3, ATI Radeon 7000, 7200, 7500 or 8500, or Matrox G450 Video Card
DirectX Compatible Sound Card
DirectX 9
MAXIMUM
Windows 7/Vista (32 or 64 bit)
Intel i7 Quad Core 2.8Ghz or AMD equivalent
3GB System RAM (High)
30 GB Hard dDisk Space
nVidia GeForce 9800 GTX / ATI Radeon HD4850 Video Card
Direct X 9.0 compatible supporting Dolby Digital Live
DirectX 9.0 - DirectX 11
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