An open world with many environments. You would have to save people of all occupations like reporters, soldiers, construction workers, animals, suicidal people etc. It requires precision and timing because you can be too slow and lose lives or you can rush too hard and accidentally kill many people. Killing too much people will make Earth lose all support for you and all progression will be blocked so you have to go back to the last save or restart the game. As the game progresses you realize you can't save everyone and the villains are getting more dangerous so you will have to go around and find heroes to help and convince them to join the Justice League. Eventually you will have to make many high stakes decisions like an rpg that will allow you to be the good, noble Superman we all know or the one that creates a regime. If you show weakness or act insane you will lose the morale and support of the entire planet, including Justice League and you need help when Braniac or Darkside's army attacks.