Enchanted Sword Seed: 1.1.1.235012488 Small Corruption
Go left and enter the first cave opening down there will be the sword

Hermes Boots/Aglet Seed: 1.1.1.1729150947 Small Corruption
Go left in to the opening and in the first chest there will be the aglet,For the hermes boots continue going down and it will be in an abandoned house inside a golden chest.

Water Walking Boots Seed: 2.1.2.94252657 Medium Crimson
The boots are in a chest in the Western ocean at the very edge of the world.

Lava Charm Seed: 2.1.1.997093721 Medium Corruption
The Lava Charm is in a chest at 1791 East 2050 Cavern layer

Ice Skates/Ice Blade Seed: 2.1.2.824945249 Medium Crimson
Go directly right to the first snow biome cave entrance and follow the path directly down until you get to the house. Ice skates are in the chest in the house and ice blade is in the chest in the water to the left of the house.

Ancient Chisel/Magic Conch Seed: 3.1.2.730553149 Large Crimson
Magic Conch is at 1633 West 1138 Caverns
Ancient Chisel is at 1673 west 978 Caverns

These are world seeds which have been discovered as secret easter eggs that generate worlds with strange or unique features. Unlike regular world seeds, which affect only the usual world structure, secret seeds can produce worlds with characteristics that would not be attainable through normal world generation.

Also whenever you enter a secret seed for the first time you will get the "A Rare Realm " achievement

1. Drunk World
In this seed, both Evil biomes will generate, as well as both variants of any ore that comes in two varieties. The Party Girl replaces the Guide as the starting NPC, and the Dungeon entrance is now generated under a Living Tree painted brown.

2. Not the bees
This seed generates a world dominated by bee-themed biomes and bee-related items and structures.
Most of the world is replaced with the Jungle biome, with Hive and Honey Blocks found in abundance, and Larvae spawn throughout the world. The Merchant replaces the Guide as the starting NPC. He will sell the Furnace as per usual in the Jungle.

3. For the worthy
This special world's features aim to drastically increase the difficulty of the game.

All enemies' contact damage, health, and coin drop rates are increased, in addition to the world difficulty multiplier, by their standard amount in a normal world. After that, the damage is increased by another 1/3 (33.33%).Also in this seed every Demon becomes a Voodoo Demon so you are guarenteed to get the Guide Voodoo Doll.

There are also many other changes to world generations and game mechanics. For instance, some water pools throughout the world are replaced with lava. Pots and trees may drop lit Bombs that shortly explode, instead of their usual items. Skyware Chests are replaced with locked Gold Chests but they still have their respective loot.

Bosses also receive changes to the size and/or AI that make battles much more difficult.

4. Celebrationmk10
This seed celebrates Terraria's tenth birthday, on May 16, 2021.

The player's spawn point is on the beach of one Ocean. Andrew the Guide, Whitney the Steampunker, Yorai the Princess, a Party Girl, and an Angora Town Bunny will also spawn there and a Party immediately starts. A majority of the world is painted in bright colors.

When You die you burst into confetti

Items in chests always have a "best" modifier such as Menacing or Legendary.

Two unique enemies can be encountered in this seed:

The Jungle Mimic can be found in the Hardmode Jungle.
Golden Slimes can rarely spawn.

The chance of obtaining rare items such as the Rod of Discord and developer items is substantially increased, the Traveling Merchant always sells 2 extra items, and the Princess sells rare items such as the Slime Staff and Discount Card.

5. The Constant
This seed is part of the crossover with Klei Entertainment's Don't Starve Together.

It introduces hunger and darkness mechanics that make the early game especially challenging. Marble biomes with statues and Spider Caves will generate on the surface, and Cacti will damage the player.

The entire game uses a dark shader that gives the game a gloomier look. Items exclusive to the Don't Starve crossover content are more likely to drop.

6. No traps
This seed includes significantly more traps than a normal world. It also contains new traps, including the Bouncy Boulder, the Life Crystal Boulder, and the Venom Dart Trap.

7. Don't dig up
This seed flips the usual order of player progression through biomes by having the player spawn in the central part of the Underworld. Above that are, in order, a Glowing Mushroom biome, an underground version of the Surface biomes, the Underground layer, the Cavern Layer, and then the true surface which is the Evil biome, without a sun.

A flat Ash Block "island" is generated in the central part of the Underworld, with Ash Trees growing and lava not spawning at all. Mimics now spawn in pre-Hardmode, but drop Gold Chest loot during this period instead. Plus, slimes have a chance to contain Fallen Stars as their bonus drop, and they can also spawn from broken Pots (such ones will always contain a Fallen Star). In addition, Lava slimes do not generate lava upon death in Expert Mode and above.

The Tax Collector replaces the Guide as the starting NPC.

8. Zenith Seed/Get Fixed Boi/Everything Seed
This seed is a combination of drunk world, Not the bees, For the worthy, Celebrationmk10, The Constant, No traps, and Don't dig up seeds.

It also contains unique features, including the boss Mechdusa[terraria.wiki.gg], which replaces the mechanical bosses in progression, as well as features like Crispy Honey Blocks that burn the player and release Lava when mined.