Colobot [Wikipedia]

"Colobot (Colonize with Bots) is an educational real-time strategy video game featuring 3D graphics. The objective of the game is to find planet for colonization by the human race by establishing basic infrastructure on the surface and eliminating any alien life forms endangering the expedition. During the game, we'll get on the Earth, Moon and 7 fictional planets. The main feature of the game which makes it educative is the ability of the player to program his robots using a programming language similar to C++ or Java."