Any suggestion appreciated The background or the world: The ship sunk into the ocean during storm. When the player wake up, he found he was in a strange place. In fact, the player is in the center of the earth. Similar environment as the movie "Journey to the Center of the Earth" (Maybe I will add a NPC as the player's little daughter, it is used to balance the game if necessary) The player can find many crashed planes and ships here, so he can craft modern equipment . Of course, dinosaurs are here. In fact, Hades exist in the center of earth as well. The player place is outside Hades' kingdom, but adjacent. So his place has lot of evils' spirits, they are afraid to enter into Hades' territory. The player's spirit will leave his body when he sleeps, so his daughter. When they wake up, their spirits will return. The player need to survive in two states. Then I will begin to design player stats.