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>> o'donnell: a new video game that premiered today may be like none you've ever seen perhaps because its developer faced challenges few of us will ever experience. jan crawford introduces us. >> it's the sound of a gun. >> reporter: for lual mayen, this is more than a video game. it's a personal story. to survive... >> you have to keep going. >> reporter: the 25-year-old knows about survival. his family fled war-torn south sudan. he grew up in a refugee camp in northern uganda. there was no electricity? >> there was no electricity at all, there was no school, there was nothing. >> reporter: but it was there in a refugee office when mayen was 12 that for the first time he saw a computer.