Stack by stack is a tower defense game where you stop viciously cunning and diabolical robots from stealing your base’s power core, perhaps even saving the entire world in the process. Adventure modePlay through 25 beautifully hand-crafted levels Unlock new designs and machines to help you against the robot hordes. Combine existing designs to create even greater things. Collect and modify resources through drilling and smelting collectibles. Game features:Recycle enemy robot parts into metalUse harvested metal to create towersUpgrade towers through discovery of new parts via 3D PrintersManage your base, building, repairing, rebuilding, and upgrading your towers and itemsDrill for ores to smelt into metals to supplement metal stolen from deceased robotsVirtually everything in the game can be carried in a stack in your hands