Here's the playable Windows PC demo of Gratuitous Tank Battles, Positech Games' innovative indie strategy / tower-defense / management / sim game for the PC.

Gratuitous Tank Battles is the spiritual successor to indie hit 'Gratuitous Space Battles', the 'hands-off' battle simulation set in a universe at perpetual war. GTB is set in an alternate earth history where World War I never ends, and Axis fights Allies across Europe in the year 2114 complete with a mix of Tanks, Infantry and futuristic mechs.


Unique Features (why GTB is different from every other tower defense game).
• GTB allows you to play in either the role of attacker or defender on any of the maps
• GTB has support for ‘adaptive’ Ai instead of pre-scripted waves of enemies, making the gameplay far more complex and fluid.
• There is a built-in easy-to-use map editor that makes changing an existing map or creating a new one accessible for everyone.
• An integrated online-challenge system allows you to easily download and play any map that any other player of the game has made and shared, for infinite gameplay variety.
• Every unit in the game is designed and customised by the player. No more stock units. GTB relies on a high degree of player customisation.
• You can play an attacking game, then save out a recording of your attack, then play against yourself in a defenders role.
• The game is easy to mod, adding new units can be done by anyone with a paint program and notepad.

What are the system requirements for the game?

"This is always difficult to answer. GTB was developed on a quad core Intel i7CPU with 8GB RAM and an ATI HD 5700 Video card, on which it all runs very well at 60FPS fullscreen 1920x1200 res. It very likely runs fine on much lower spec PCs, we have even seen it run fast on a laptop. We will add more information on system specs as the beta-testing period goes on. The minimum screen resolution height is 768, which rules out some netbooks, but they probably do not have the video horsepower to run the game in any case. There are lots of options to turn down the graphics settings within the game."