For example, instead of the lunar rendezvous method that NASA chose for the Apollo program, the player can opt for Earth-orbit rendezvous or even direct-ascent where a single giant spacecraft lifts off from Earth and lands on the Moon.
These Syrians - some 250, 000 mainly Kurdish farmers - have been forced off their farms over the past two years because their lands were reclaimed by the desert.
In the valleys of what is now the Swiss canton of Valais, small groups of farmers left their villages and set off east across the mountain passes in search of new lands.
House Democrats announced a plan of their own on Tuesday that calls for increasing oil production in areas that have already been roped off by the federal government for exploration and drilling -- lands that already account for some 89 percent of the nation's untapped reserves.