In Terraria you have to dig, fight, build and craft as the world is at your fingertips. Also you can build cities, destroy bosses, mine valuable ores to craft better gear and get good loots from events such as the goblin army. In the Halloween update that will soon come out you can get goody bags and there will be more bosses what will mean more loot and more sweets. It is 4+ on all devices. I enjoy it so much because I can play multiplayer with my friends or any one I want to.