Paint and dig tiles, build a biome, drop in chests, then walk the world to test it. Plan your files, read a tModLoader log and download your world. All in the browser, so it works on a school computer.
Tip: paint the ground first, then stone, then trees on top. Turn on Wall mode to place a background wall, which is what stops enemies spawning.
Pick an object, then click the map on the World editor tab to place it. Objects sit on top of the ground you already painted.
Place some tiles, then check the biome your world reads as.
In Terraria a chest, a torch or a door is a real object placed at a tile. In TEdit you place them the same way. Chests can hold loot, torches light a room, and doors let the player walk through a wall.
A biome is counted from the blocks around it: enough sand makes a Desert, enough snow makes a Snow biome, and plenty of plain grass and trees is Forest.
Name your world, then press "Build my world files".
Click a red line to see what went wrong and how to fix it.
Click a red line above.
A healthy launch lists every mod it loaded, then loads the world with no red lines. If a line is red, it usually means a mod is the wrong version for your game, or the folder is nested twice.
Always keep a backup copy of a world before you edit it. If something breaks, you put the backup back and try again.
Save the world you are building here, then load it again later. It stays on this device.
This is your no-install world builder. Pick a biome tile on the right, paint the map, then press Start walk test to walk your world.
