Medieval Engineers is a sandbox game about engineering, construction and the maintenance of architectural work and mechanical equipment using medieval technology. Players build cities, castles and fortifications; construct mechanical devices and engines; and perform landscaping and underground mining. Not to mention that you can create siege weaponry to attack your foes!
CPU: Intel Core 2 Quad Q6600 @ 2.4 GHz, AMD Athlon II X4 620 @ 2.6 GHz or better
Video Card: AMD Radeon HD 5830 / NVIDIA GeForce GTS 450 with at least 1024 MB VRAM or better
Free Disk Space: 5GB