OS: Microsoft® Windows® XP with SP2 / Vista / 7 Processor: Intel® Pentium™ 4 2.4 GHz or better Memory: 512 MB RAM Hard Disk Space: 250 MB Video Card: Any OpenGL 2.0 graphics card with 256MB+ video RAM and full GLSL support DirectX®: DirectX® 9.0c Additional: One keyboard, controller, or mouse required per player. Supports multiple mice and/or keyboards. 3-buttons required for mouse play.