Defence Condition is a free PC remake of the classic arcade games Defender and Stargate. Your mission: protect the humans on the ground from hordes of aliens trying to abduct them. Exciting missions. Optimized keyboard input -- no explicit Reverse button. Adjustable display dimensions -- fit any monitor or simulate widescreen mode. Ripping battle visuals and sounds. Play in windowed or fullscreen mode. Blur and interlace arcade monitor effects available. Numerous customizable preference variables, including ship physics and difficulty. Full C++ source code available under the GNU General Public Licence. For the latest binary, please click here. For the latest source code, please click here.