Twenty waves. One core. Hold the line - in full 3D.

A fully 3D isometric tower defense: place pulse, laser, slow-field and splash emplacements along a glowing circuit trace to stop UFO invaders before they reach the core crystal. Drag to pan, scroll or pinch to zoom, and tap tiles to build. Four tower types with two upgrade levels each, six enemy types, five boss waves and twenty waves total - the same deep economy as the original Circuit Defense, rebuilt with real 3D models, dynamic lighting and shadows.