No traps

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

No traps is a secret world seed. Its name is a sarcastic reference to how it generates significantly more traps in the world than usual.

The following seeds can be used to generate a No traps world (case-insensitive):^[1]

World generation changes

Example of trap generation and density in a No traps world (Torches added for visibility by player). Wired statues and a Bouncy Boulder are visible.

Trap generation within a Glowing Mushroom biome. In addition to wired statues and Explosives, note the piles of multiple Boulders.

Traps are 100 times as common, compared with a regular world.^[2]
- Traps can spawn in Glowing Mushroom biomes.^[3]
All Gold Chests are replaced with Dead Man's Chests.^[4]
Statues are 15 times as common, compared with a regular world.^[5]
Gas Traps have a 1/20 (5%) chance to appear in any Chest.

Dart Traps spawn on surface. There are relatively few near spawn point, but they become more frequent further away.
Living Trees can spawn with Pressure plates and Explosives under them instead of Chests.
Floating Islands spawn with traps, either Dart Traps, Explosives or both.
One or both of the Oceans may generate with a variety of traps and Boulder piles.

In addition to regular traps, a variety of unique, exclusive traps and trap configurations are generated:

Bouncy Boulders, replacing Boulders in a Boulder trap. These bounce around wildly upon release, similar to the Bouncy Grenade and other bouncy player weapons.
Life Crystal Boulders, which have the same sprite as Life Crystals, but will act as Boulders once mined, damaging the player. They turn into mined Life Crystals when they come to a rest.
Occasional TNT Barrels.
Underground Cabins generally spawn with traps inside them (Explosives or Dart Traps).
Boulders tend to appear in open areas in groups, often found stacking on top of each other in a triangle, similar to how spherical objects tend to stack.^[6]
Many of the traps generate statues which are wired up. These appear to be random decorative or critter/enemy-spawning statues.
- These can appear in large groups all wired together in Glowing Mushroom biomes, which can cause very large armies of enemies to spawn at once when activated.

Boulders and Bouncy Boulders are generated inside the Dungeon, as well as Explosives attached to Pressure Plates.

Geyser traps are far more frequent, and can generate inside Ruined House structures along with Dart Traps.

The No traps world icon shows a regular tree with Wire coming from the base.

Because so many traps generate in this world, players can create one to harvest large amounts of mechanisms, Wire, and statues.
Dangersense Potions are especially useful in No traps worlds as they make it easier to find and avoid traps.
Holding Pressure Plates reveals wire early on, which can help with early exploration.
The Mechanical Lens and Wire Cutter, both sold by the Mechanic, can be used to reveal placed Wire and disable traps, making exploration much safer in the long run.
- It is highly recommended to craft them into The Grand Design, which provides easy wire cutting in long range.
In the late game, a flying mount such as the Witch's Broom can negate the majority of traps by avoiding pressure plates.
The large number of statues in this seed makes finding Heart statues and Star statues much easier.
Geysers can easily ruin a Wall of Flesh fight. Make sure to clear them out on a long, clear path ahead of the fight, as they often cover every available surface, giving the player nowhere to safely land if not using a Hell Bridge.

↑ Information taken from the Desktop 1.4.4.9 source code, method ProcessSpecialWorldSeeds() in Terraria.GameContent.UI.States.UIWorldCreation.cs.
↑ Information taken from the Desktop 1.4.4.9 source code, method GenerateWorld() in Terraria.WorldGen.cs. The relevant world generation pass is called "Traps".
↑ Information taken from the Desktop 1.4.4.9 source code, method placeTrap() in Terraria.WorldGen.cs. The game will no longer check for nearby Mushroom grass before placing a trap in No traps seed.
↑ Information taken from the Desktop 1.4.4.9 source code, method AddBuriedChest() in Terraria.WorldGen.cs.
↑ Information taken from the Desktop 1.4.4.9 source code, method GenerateWorld() in Terraria.WorldGen.cs. The relevant world generation pass is called "Statues".
↑ Information taken from the Desktop 1.4.4.9 source code, method GenerateWorld() in Terraria.WorldGen.cs. The relevant world generation pass is called "Pots".