Terraria's game world has 3 different options, small, medium, and large. After players select the map size, they can officially enter the game. Although the game allows players to do whatever they want, players also need to survive by collecting resources such as wood, stone, metal ores. All the player's actions in the game can be summed up as exploring everywhere, digging everything, hitting everything, and constantly building. This is also the basic premise and simplest definition of a game. 

After starting the game, players can build a house for their game character. During the day of the game, players need to face different enemies like vultures. At night, players can spend the night in this house. Because, at night, the player will face more dangerous enemies like zombies, and they will do more damage to the player. If the player likes to hide in the house for the night, then they can make it their goal to build a greater mansion. But players need to constantly collect materials for this. 

Each world in Terraria has different biomes, such as ocean, jungle, desert, and underworld. Because players will encounter different and dangerous enemies in each biome, they need to collect as many resources as possible and craft armor and weapons to protect themselves. Players can learn in the game guide what combinations of materials create the best combination of weapons that do more damage or learn which armors can improve the player's defense attributes more. In addition, in the game, different bosses must meet different unlock conditions to fight them. However, because of this, these bosses can help players find goals in Terraria's game world, and after defeating the bosses, players will drop various rare items and other materials that help the player's adventure. 

Terraria is not a game that players can complete in a few days, and it even requires players to be prepared to spend a lot of time in the game world training, digging, building, hitting, or exploring.