Normalmode or FFA was the first gamemode to be added in mope.io. It is different from Sandbox in many ways: First of all, there are 55 different servers which are located in different parts of the world. Go see the servers page to see the full server list.
To gain XP in normal mode, you will have to eat Food, tailbite predators, feed on healing stones and eat lower tier animals to gain XP. You also must escape from animals bigger than you and drink water in order to survive.