Castaways is an open-world sandbox survival MMO where players starts adrift at sea on a raft or on an island. In the seas players can fish for food, tools and crafting materials before finding an island to call home. Players can harvest the resources on their island to build on it and expand it and invite other players and start a thriving civilization. Players must initially be strategic with the use of their resources as they may be finite or take long periods of time to replenish to survive. Players can travel the seas to find other islands and trade valuable goods with other castaways or fight them for their loot.