There is a great (and addicting) game called Crystalien Conflict by Lego. Sadly it was retired about two and one-half years ago. But, the people at 4t2.co.uk have posted it at this site: http://legomars.4t2portfolio.co.uk/?v=6_5
Now you can enjoy Crystalien Conflict for as long as you want and when you want.
P.S. one code for the game is nightfall.