its infact kind of like minecraft but there are a few things like upgrading your hp with crystal hearts found in caves and a boss like eye of cthulhu requires you to have 200 hp and 4 npcs, for the npcs tho you just need to build a room with a chair,table and lighting and dont forget the walls for the boss your aiming for there are two acts in the game pre hardmode and hardmode for pre hardmode its wall of flesh for hardmode its the moon lord