Known Bugs And Glitches

''This is a list of Bugs and Glitches currently in-game. If you find a bug, please list it below to allow others to see.''

''Keep in mind though, just because a bug can be exploited doesn't mean you should or shouldn't. You need to play the game the way it is most fun for you. Duplicating items may seem like a good thing to do at first, but it can rapidly make the game a lot less fun to play.''

''NOTE: This is a clustering of various separate bug and glitch pages. It needs cosmetic and redundancy work done on it. (BADLY!)''

General

 * Sometimes when you load a save file, your NPC's in that save file will be lost and you cannot open your chests. However you can break the chest with a Hammer but if you place it again, the items placed in the chest are lost.
 * During a Blood Moon, zombies level with a wood wall can inexplicably turn that wall into a door, then proceed to open it, and enter your home.
 * The Hermes Boots can let you fall through gaps in the floor one square wide if you run into a wall just above it fast enough.
 * Blowing up a chest with dynamite causes the chest to duplicate 10+ times. Also, forming obsidian over the top half of the chest leaves you with the bottom half of the chest that can be "removed" infinitely, allowing for infinite free chests.
 * Upon forcing the game to quit, (ie Windows Task Manager), the game saves the items in one's inventory, but any blocks placed or changes to the terrain will revert to the last time the game was saved correctly.
 * Placing a torch onto a piece of wild grass next to a door causes the torch to duplicate. This bug can be exploited to have a lot of torches without getting a lot of slime gel.
 * Placing two doors adjacent to one another and repeatedly opening and shutting them may lead to one of the two doors glitching, which results in spawning an infinite number of duplicate doors whenever the adjacent door opens or closes. Though extremely tedious, it is possible to exploit this glitch to earn significant amounts of gold, as each stack of 99 doors is worth nearly 40 silver.
 * Grappling onto the middle of a door (just above the doorknob) and opening the door will fling you forward at the grappling hook's pulling speed (Glitch or intentional?)
 * Fall damage is inconsistent when landing on anything 1 block (sometimes more) thick.
 * Removing sand from underneath a demon altar causes the altar to disappear, although it is relatively rare to find demon altars on sand. (Glitch? Game could possibly be removing it to prevent flying altars)
 * The game can speed up for no reason, in both single player and multiplayer; this mainly seems to happen when game is first loaded up. This glitch may have been fixed for multiplayer in the 1.0.3 update.
 * It is possible to use the grappling hook or its variants to go through tight spaces you can't normally get through. This can kill you if you try to do it near sand.
 * Sometimes if a player joins a multiplayer server, the menu music may still play while the in game music is playing. It may or may not be caused by the same thing as when day and night music play at the same time.
 * Sometimes if you have autopause enabled, you can open your inventory near a workbench, anvil, etc then go somewhere else that has only a chest and open the chest and it will act like you have those other things nearby. Ex: Open inventory near a hellstone furnace. Run up to the surface and right click on a chest. Have hellstone and obsidian in the chest and put it in your inventory. Craft hellstone bars. Also works when you are in water, then run to a chest and withdraw bottles, then you can craft water bottles even when you are not in water.
 * If you stack sand on a dirt block and use the Dirt Rod on it the sand will fall into the dirt block and you can move both dirt and sand around. if you drag it over your charecter it will hurt you but whether it hurts enemies is not known. When the dirt is dropped the sand can be picked up, sometimes with double the amount put on.
 * When a player spawns into a world that has had the land below the spawn point mined out to a depth of 10+ blocks, the player will take around 8000 fall damage and instantly die. occurs only for the initial spawn, any spawn from the player afterwards will not result in the glitch.(Needs Testing)
 * Occasionally, clicking the GUI opened for a sign can cause the game to crash and pull up a .NET error message.
 * When you are about to die, you can save your gold coins, for example, by quickly opening your inventory, then left-clicking on your gold coins. If you respawn after your death, your gold coins will respawn next to your character and can be picked up.

NPCs

 * NPCs continue to occupy a general area even if it is no longer 'suitable' for NPCs
 * When purchasing items from an NPC brings you down a coin tier (1 gold coin to 99 silver, etc.) there is a chance the game will register the higher coin as still being there, though the sprite will not show and it can not be spent. This can be fixed by mousing over each coin space in your inventory until you find the invisible coin (the item name and amount will show) and left clicking it. Until it is fixed, the game will attempt to stack all additional money with the nonexistent coin, resulting in lack of funds.
 * When the Nurse stands on a chest and right-clicked, her dialogue is brought up for approximately two seconds before the chest suddenly is opened.
 * NPCs sometimes have pathing issues when attempting to reach their rooms. (Particularly blocks over 3 squares high they can't jump past.)
 * NPCs have pathing issues regarding Wood Platforms

Monsters

 * A one block high space allows slimes to spawn, but also allows them to jump through the floor as most slimes are two blocks high
 * Demon eyes can sometimes travel through 1 block thick dirt.

Map Generation

 * Jungle Shrines can be generated in lava pools with no chest inside them. (Screenshot)
 * Jungle Shrines can be generated in the sky (~15 blocks above the ground) (Screenshot)
 * In some map instances, it may be impossible to find certain unique items. (Intentional)
 * Oceans may spawn where Dungeons should be, causing the entrance to the dungeon to be visible but lead to the ocean. (Note: the Old Man may spawn in the ocean as shown in the screenshot) IMG_01072011_151923.png'll have to have a Nightmare Pickaxe to dig in through the ground after beating Skeletron or flood the dungeon by going through the sand, which is not recommended, however, you can build an area closed off to the rest of the ocean where you will start digging to the dungeon so that you will flood less of it.
 * Chasms can also spawn where dungeons should be, and some times block the way. In this case, you'll need a Nightmare Pickaxe to dig it, opening the way to the dungeon.
 * Corruptions can be generated within 100 blocks of the main spawn upon initial map creation, without sunflowers blocking them. These corruptions can spread and cover the spawn.

Weapons

 * Boomerangs and Flails can be thrown through 1 block thick walls if the player is in contact with the wall and the weapon is aimed at a slightly-below-level angle.
 * When moving a dirt block with sand block(s) ontop of it using the Dirt Rod, the dirt block will mix with the sand and also do damage to whatever/whomever it touches until released from control. (This could theoretically be used to attack players in multiplayer mode, even without PvP enabled, since the damage incurred would be environmental damage. [untested])

Walls

 * Sometimes the background("Wall") when underground (rocky and mud-rocky) will start to follow you and glitch, jerking about in random motions, there is currently no known fix to this bug. Although waiting for a Terraria update may help, for they reset all files on update.
 * You can throw/shoot some weapons (Fiery Greatsword, Sunfury, Ball O' Hurt, Phoenix Blaster ect.) through a 1 block thick wall and doors

Meteors

 * The lighting effect of a meteor crash site may remain even when all meteor blocks have been mined.

Water
thumb|left|400px
 * It is possible for a small puddle of water to turn into a never-ending waterfall when the bottom is dug out.
 * An infinite pool of water can be made with an upside down "J" dug into the ground by placing water in the center, taking it out of the shallower side, and repeating.

Crash

 * The game crashes upon exit from the title screen on some games.
 * If the game crashes unexpectedly, is then restarted and the same world reloaded, all blocks are removed and the player falls directly to the bottom of the map causing them to die. All world data appears gone and cannot be retrieved although map files still exist. (In this case, you can either use Cloud in a Bottle or Rocket Boots to survive the fall at the bottom when the screen no longer centers on your character. Hellbats will spawn out of the bottom of the screen and pools of lava can be found in Hellstone, along with Hellforges. Further exploration has shown that not all blocks in the rest of the world have disappeared, though most have. There will be large amounts of dirt and stone with minerals spread throughout it, but suddenly cuts off at the point where the rest of the world seems to have disappeared.)
 * If you save and exit a game it will save extremely slowly sometimes.
 * Putting a laptop to sleep by closing it while in-game can sometimes cause it to crash when you save and quit.

Gameplay Multiplayer

 * If you place a chest onto any block type, break it and try to replace it onto the same 2 blocks, it is unplaceable. The block type doesn't seem to matter. Relogging from the Multiplayer server seems to fix this issue.
 * If a client's program crashes or ends unexpectedly, the client's character won't save and will still have the same inventory that they had at the start of the session. This can result in items duplicating or disappearing entirely.
 * Sometimes, holes will inexplicably appear that lead to the bottom of the world. Since this does not happen in singleplayer, it is assumed to be a server-side bug. There is a way to avoid it by placing your base near the left edge of the map from the start, as the "hole" always happen to be on the same spots everytime (Picture)
 * If you minimize the server window, the time goes faster (when clicking the server window button in the task bar, might only happen on Win 7/Vista.). It looks like the sun and moon "teleports" forward. And the monsters are super fast. Maximizing the server window fixes this.
 * Game may crash if you save your spawn point in a bed and reconnect - the server must be reopened.
 * If the players fail to kill Skeletron, the old man may not respawn. The players will still get attacked by skulls in the dungeon itself. This bug seems to occur if a spawn location is set within sight of the Skeletron.
 * If players set a spawn point that is at the "end of the world" (past the beach and over the water) and disconnect from the server, they will be unable to reconnect. The reason for this is unknown, and the problem is fixable if the affected players connect to the world in single player and reset their spawn point.
 * Setting a spawn point at a high elevation (i.e. on a floating island) may cause a player to be unable to reconnect.
 * The Eye of Cthulhu may fail to spawn when summoned.
 * If you start to play on a server for a while you might get kicked and it will say "explosions are disabled on this server" and this will happen for about 10-15 minutes. It is thought to happen when players destroy many blocks within a small time frame on a laggy server and the server recognizes it as an explosion.
 * Eater of Worlds may spawn away from where the third shadow orb was broken, near another player in Multiplayer.
 * Gold Chests may not appear gold to all players. Some Gold Chests may also appear to be part gold to some players. This is fixed on reconnect.
 * Planted flowers may not appear the same to all players (i.e. daybloom may look like blinkroot and vice versa).
 * Shadow orbs may not appear to be whole (i.e. a quarter shadow orb), but still act like a whole shadow orb (i.e. the quarter shadow orb summoning the Eater of Worlds)

Visual

 * Alt-tabbing in and out rapidly can cause unusual colors. Alt-tabbing again fixes.
 * When playing a world for the first time there is a chance no Hud/GUI is displayed. (Can be fixed by pressing F11)
 * Moving to fullscreen causes all things to speed up i.e. the sun and moon move at an increased pace. The cursor also speeds up, this also affects single player. (multiplayer not known) It is widely suspected that this is because your monitor's refresh rate overwrites the game's when running it in fullscreen.
 * When running the game in windowed mode, clicking on another window that doesn't cover the Terraria window will cause any light from Mining Helmets and armor sets with lighting effects to vanish (does not occur in multiplayer). Clicking back into the window allows it to light correctly. This does not affect the game, as it pauses when another window is clicked.

Audio

 * Both the day theme and night theme can play at the same time if the change happens on the instant of the current song being re-looped. This will last until the theme playing before the change of day/night starts a new loop.

Item Cloning
Item cloning can be performed by placing an item in a container on any server, saving the server, then starting it again. Once the player revisits the container, if they take the item, disconnect, then close the server improperly (such as alt + F4 on the server tab) without letting it save, the item can be found yet again in the container. For example: A Video Showing this method can be found here OR
 * 1) Player A leaves item A in a chest.
 * 2) Player A disconnects.
 * 3) Server is disconnected/saved.
 * 4) Server is reconnected.
 * 5) Player A connects and takes item.
 * 6) Player A disconnects.
 * 7) Server is closed abruptly without saving the map.
 * 8) Server is reconnected.
 * 9) Player A joins.
 * 10) Player A takes item A and now has a duplicate.

OR
 * 1) Player A drops an item in a server.
 * 2) Player A disconnects abruptly.
 * 3) Player A rejoins server.
 * 4) Item is still in Player A's inventory as well as in the server.

You can create and mass produce items in multiplayer from chests, to do this you require some teamwork with another player, player A puts 1 gold ore in a chest slot, player B checks the chest, player A removes the gold ore, player B can now rightclick the spot were the gold originally was and obtain a gold ore, he can then proceed to rightclick empty chest slots to increase the number of ores he has, however, these ores are nameless and can-not be used in crafting, but they can be placed on the ground then mined, now with a name and now craftable, since this can be done with any ore, all endgame items can easily be obtained after the players obtain at least one hellstone, it also renders musket balls useless as meteorite shots can be made on demand for just 6 ore per 25 shots, it should also be noted that players are able to sell the nameless items for the same worth of the item being duplicated, letting players duplicate endless diamonds for consistent coins, dropping any nameless items results in the item being randomly made into something else with the exact same number in the stack but is still nameless.

OR

The easiest way by far to clone items is to simply clone the item world file. This can be done by opening the Start Menu, going to Documents, going to My Games, then clicking the Terraria folder, then the World folder, then copying the world file, pasting it in the World folder you are already looking at, and then renaming it as another world. This can only be done if you have less than 5 worlds. For example if you only have 1 world the World folder will say, "world1.wld" and "world1.wld.bak". You can copy world1.wld and paste it again and it will be named "world1 - Copy.wld". Rename this as "world2.wld" and then exit the folder and start Terraria. The game will assume this is just your second world file but it will really be an exact copy of your first world. I have used this to duplicate platinum coins, hellstone arrows, potions, etc. It works for everything.

There is also a way to duplicate doors by placing a thin layer of lava on the ground that does not hurt you and placing a door in a doorway. Once you have placed the door, right click it continuously, do this and you will have stacks of doors, if you require them.

Flying Chest On Sand
For this glitch, you must place two columns of sand. Place a chest at the top of the sand, and destroy the sand under the chest. Flying chest!

Single Player

 * If an NPC opens your door and you continually right click it, the door disappears.
 * Parts of your home can disappear for no reason.

Fixed Bugs
These bugs have been fixed and no longer exist in the current version of Terraria.

General:

 * After knocking down a large tree, pieces of wood get stuck underground and stay there until you dig them out.
 * Place a door under water and constantly open and close it. The water will slowly disappear up to the base of the door. This is probably caused by the water in the 3 blocks that the door occupies being destroyed when the door is closed. (Water can now occupy the same space as a closed door, showing the door behind the water.)

NPCs:

 * NPCs may fail to spawn, even though there are valid houses in the world and conditions are met.

Monsters:

 * Creating an artificial jungle: even if the depth meter says you're below sea level, hornets or man eaters will fail to spawn.
 * In the Underworld, Piranhas will spawn in lava causing them to die the instant they spawn.

Multiplayer:

 * A problem in the Client-Server synchronization causing monsters to suddenly teleport to another location when they are dealt damage by the player. (If this still happens, it's because of a bad host.)
 * Game may crash when you break 4 Shadow Orbs in a row.