Teaching online video game players to save lives, not take them — that is the aim of a new product developed in an unusual collaboration between the creators of the wildly popular Fortnite games and the International Committee of the Red Cross. The new game mode, called Liferun, teaches players the four main activities carried out by Red Cross workers in more than 80 countries: caring for civilians in need, rebuilding essential infrastructure, removing land mines and distributing aid as rapidly as possible — hardly the stuff of a typical shoot-’em-up game. Three well-known players, who go by DrLupo, Lachlan and ONE_Shot_GURL, are to present the new mode Sunday at the PAX South video gaming convention in San Antonio, Texas, the Red Cross said in a statement. “The ICRC is recognizing the growing importance of the gaming community,” the organization said, estimating the number of gamers at 2 billion worldwide.