• you are completely free in action and a huge world to research ;
  
• build, blow up and defend from enemies;
  
• mine ores, use it to create various useful objects ;
  
• hunt wild boars and deer, as they can become an excellent sources of food, but beware of bears and wolves ;
  
• construct various structures, including traps ;
  
• look for provisions, drive on an old ATV among a bunch of enemies;
  
• study the legend of the 'Witnesses of the second coming ', perhaps there you will find some answers;
  
• increase your combat skills and not only (for this there is a especial panel of cards);
  
• survive by fighting with an enemy unknown to you, try to have an influence on the invasion and much more;
  
• collect the parts and find the blueprints to create a "mini - mole hole";
  
• repair the spacesuit, collect all the equipment you need, and go to Mars to destroy the bridgehead of the aliens.

Mars in When They Arrived