The goal of Lual Mayen’s video game is to survive the horrific ordeal of a refugee, an experience that his family knows well, but the 25-year-old developer’s ambition is to change the world. Mayen, who was born as his family traveled 250 miles (400 km) to escape South Sudan’s second civil war, hopes his game, Salaam, will give players a better understanding of what it means to be homeless, hungry and on the run.