Robocraft is an awesome voxel-based robot fighting game. You create robotic manned vehicles with voxel-based grid system and then go to war with your creations. User interface as well as the battles themselves closely resemble World of Tanks but the building feels very Minecraft.
Play it free here: http://robocraftgame.com/
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Intro Music: Gramatik : Hit That Jive
Any background music compliments from www.audiomicro.com