This is a remake of the original Scorched Earth that I remember playing back in Windows 95, except that it is way better. Gone are the simple mountain ranges, replaced by a 3D world, complete with tree, water, smoke etc.
In case you're not familiar with the original, the game is as follows: You have a tank, and by setting the elevation, bearing and power, you try to destroy all the other tanks on the island before they destroy you. Of course, you earn money, which allows you to buy bigger weapons, shields etc. Scorched 3D supports multiplayer action!
The only complaint I have is that the initial menu isn't GTK2 based which means it looks rather old on my nice Gnome2 desktop