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NOT-YET-PLAYABLE pre alpha, just tech experiments so far
http://ghoulsblade.schattenkind.net/webspacesim/
realistic simulation of landing and constructions on the moon using remote controlled rovers/robots and chemically processing on-site material

details

a little hobby project worked on irregularly
tech: playable in browser without plugins, using webgl and javascript
aims for realism, using current technology and prices as far as possible.
- current data (prices,weight,chemical composition,...) is just preliminary for getting the simulation mechanics running and will need intensive fact-checking and research later
- optional experiments with theoretical launch & propulsion systems only as long as they are scientifically realistic in the near future
In-situ resource utilization by chemically processing Lunar Regolith to extract chemicals and process them to manufacture Solar Cells, Propellants, Structures and other things
- construct more/bigger machines by combining components imported from earth with cruder parts made from in-situ chemicals (using Additive Manufacturing / 3D Printing)
experiments with plant-growing e.g. Hydroponics (light, temperature, and nutrients from chemicals)
later experiments with other planets, moons, asteroids, satellites,probes,landers and in space construction, and transporting material between multiple sites.
Maneuvers using Orbital Mechanics like Gravitational Slingshot and Atmospheric Drag to conserve fuel

2012-09-29 separated into own project, was originally space-test inside mountainfort experiment

one "free" launch to moon (incurs dept)
make solar cells + fuel + electro-magnetic launch systems on moon
launch fuel to earth orbit : pay back initial dept and then trade for equipment and material to expand further
access and harvest materials from near-earth-asteroids
possible goal to make self-sustaining (not reliant on earth-launches) colony for x thousand humans on moon or in orbit

no time pressure, remote-controlled robotic rover doesn't need food or air, solar cells last several years, so even inefficient manufacturing machines will fullfil their tasks eventually
due to vacuum (no air friction) and much lower gravity than earth, an electromagnetic launch systems should be feasible (if in doubt add rocket-assisted)
aluminium powder as well as hydrogen from the water-ice discovered in recent years can be produced as fuel
silicon and aluminium from regolith can be used as basis to create solar cells, at least in combination with further materials/components imported from earth
vaccum allows using thin aluminium foil without oxidation. this allows large scale mirror-arrays to increase solar cell efficiency
aluminum and iron for structures can be produced from regolith
due to high launch cost from earth, bringing fuel and iron/aluminium for structures from moon should be interesting economically, and at least allow trade for components that can only be manufactured on earth