Dimension ID: 726931095

Description: A dimension that is initially flat and made of white concrete at Y-level 0, along with one ant block that immediately begins moving and an acacia sign that says "PATIENCE" at (0, 3, 0). The ant block uses Langton's ant to determine its pattern.

Notes: The sign is a floating wall sign with no support.

Dimension ID: 236157810

Description: Has a diagonal maze pattern. It looks similar to simple mazes generated in the BASIC programming language, with flat Blue Concrete floor at Y-level up to 16, and Light Blue Concrete maze top surface at Y-level up to 32.

Notes: It appears that the maze consists of one main passage with no branches or dead ends and random squares that can be entered only from the top.

Dimension ID: 1174283440

Description: A dimension with inverted lighting: Entities and blocks are pitch black during daytime and bright in caves or at night, torches darken the area around them and so on.

Notes:

• Also darkens text and textures of items.

• The sky remains the same light level (with day-night cycle) as it is in the Overworld.

• The world generation is the same as the original world that the player spawned in.

Dimension ID: 344885676

Description: A dimension with 8x8 block creeper faces made out of randomly colored terracotta, glazed terracotta, glass, glass panes, wool, carpets, concrete, and concrete powder (Y-levels 0-31).

Notes: N/A

Dimension ID: 1113696725

Description: A dimension with randomly generated end stone bridges with the bridge surface at Y-level 130.

Notes: N/A

Dimension ID: 1028465021

Description: A dimension entirely made of the "Biome For Player With No Time For Nonsense" that generates redstone components and mineral blocks in place of ores. 

Notes: As a result of hoppers generating, this dimension is laggy. If created in buffet world, this dimension generates almost exactly as the overworld.

Dimension ID: 741472677

Description: A world containing all the dyeable Minecraft blocks - concrete, concrete powder, wool, carpet, stained glass pane, stained glass, terracotta (excl. normal terracotta), and glazed terracotta - in 16*16*16 blocks from Y=0 to Y=127. As a result of stained glass panes generating, this dimension is laggy when the player is brought into view.

Notes: There are two types of patterns in the dimension - the pattern of colors for each dyeable block and a 64*16*64 area that contains every type of dyeable block in the same smaller patterns.

Dimension ID: 94341406

Description: A dimension nearly identical to the overworld, with one exception. If the sum of a block's x, y, and z coordinates is odd, it appears completely black, as if there is no light falling on it. This produces a checkerboard pattern, although unlike the checkerboard dimension, the effect is visual only. Mobs and most other entities are also affected, based on their location.

Notes:

• This dimension also uses the same world generation as the original world.

• The pattern is three-dimensional.

Dimension ID: 378547252

Description: A dimension divided into 4 quadrants colored red (#F65314), blue (#00A1F1), green (#7CBB00), and yellow (#FFBB00). At an angle, it resembles the Microsoft logo.

Notes: Yet again, this dimension shares the original world's generation.

Dimension ID: 1929426645

Description: Full Minecraft credits text made of Netherite at Y-level 20.

Notes: N/A

Dimension ID: 484336196

Description: A dimension with a caution floor pattern (at Y-level up to 15) and two signs that say "UNDER CONSTRUCTION" (0, 18, 0) and "IOU 1x Custom Worlds" (0, 17, 0). This may have been a reference to future snapshot 20w21a, which added custom worlds, i.e. custom world generation and dimensions.

Notes: TBA

Dimension ID: 1210674279

Description: A dimension with no lighting except for around where the player spawns.

Notes: N/A

Dimension ID: 1537997313

Description: A dimension that appears similar to the overworld except it gets more broken and destroyed the further away from spawn the player goes.

Notes:

• May crash game at high X or Z values.

• The decay effect applies to water as well as solid blocks.

Dimension ID: 1896587401

Description: Large fleet of end ships in a grid pattern generated by the Between biome added in this snapshot (with four different levels starting at Y = 50, but the fourth is cut by the height limit. Every level is 50 blocks apart from each other).

Notes:

• All non-chest loot in normal end ships generates, excluding the Elytra.

• If the between dimension is generated in a Buffet World, the layout is different than in this dimension and the custom dimension generates void instead of stone.

Dimension ID: 307219718

Description: A quartz path museum featuring Helical-shaped sculptures of random blocks with some having random data values (e.g. if a slab is waterlogged or the plant that appears inside the plant pot).

Notes:

• The stands of "block DNA" have seemingly random minimum and maximum heights between themselves, however, they do join in the middle and have a mirrored top and bottom (i.e. whatever blocks have been generated above the center are mirrored below it with corresponding y-value differences). The middle is at the same y-value as the quartz path, which is Y=128.

• Any note blocks play the sound of a random instrument when activated, despite having no blocks beneath them.

Dimension ID: 894945615

Description: A regular Overworld dimension but filled with holes in the shape of the "Shapes Biome".

Notes: The holes can form in water.

Dimension ID: 1098962767

Description: A house in a dirt flatland (at Y-level up to 63 in Superflat) that contains a villager named bob, three dogs and a hidden underground chest among other decorations. The house is referred to as house_of_bob in the files.

Notes:

• The signs say "INGEN REKLAM TACK!" (which means "NO ADVERTISEMENT PLEASE!" in Swedish) and "GO AWAY!"

• The hidden chest contains rotten flesh, bones, and an iron sword named "Stabby McStabface" (similar to Boaty McBoatface).

• The dogs' collars are the same colors as the "Blue", "Green" and "Red" dimensions.

• The dogs are named "Bob's dog", "Bob's Other Dog", and "... their cousin Jim".

• Bob is a Jungle villager.

• Mobs do not spawn.

• There are ten infinite boxes of books and three empty, unwired trapped chests in the basement.

• There is an empty jukebox upstairs.

Dimension ID: 1902968744

Description: A dimension that infinitely generates connected structures consisting of Boxes of Infinite Books. A direct reference to The Library of Babel by Jorge Luis Borges.

Notes: The library pattern extends to the depth limit and the height limit.

Dimension ID: 31674686

Description: A dimension with several peaceful rooms with a llama equipped with a lime carpet and signs that say "RELAX!" and "ENJOY!" in colored text. A painting (sunset_dense) and lit nether portal are also present.

Notes:

• Hidden next to the portal behind the wall there is a secret chest with a book named "A Book" authored by the "Developer", which says "Nothing to solve". Throwing the book into the portal brings the player to the 709,735,702nd dimension, but this dimension seems purely random.

• Many rooms generate, all exactly the same, but they are separated by several layers of bedrock.

• The portals use the minimum requirement of obsidian.

Dimension ID: 2003598857

Description: An empty dimension with the message "We apologise for the inconvenience." written in fire, as was a similar message in The Hitchhiker's Guide to the Galaxy by Douglas Adams.

Notes: N/A

Dimension ID: 1011847535

Description: A shrine made out of quartz with beacons and a chest with the footprint item.

Notes:

• The iron golems that spawn in this dimension lack any mob AI.

• There is a sign underneath the netherite stairs that says "this is not a sign". This is a reference to The Treachery of Images by surrealist painter René Magritte.

Dimension ID: 1834117187

Description: A flat dimension made out of noteblocks at Y-level 0 that play random noteblock instruments and pitches despite receiving no redstone power or player input, and lacking any blocks beneath them. The noteblocks stop playing when the player goes into spectator mode.

Notes: N/A

Dimension ID: 1036032341

Description: A dimension that is empty, except for a grass block and a sign stating "Ha! I lied!" and "This isn't nothing!" at (502640, 99, 1482448). The chunk coordinates (31415, 92653) are the first digits of pi (the first 10 significant figures of pi (truncated), 3.141592653).

Notes: N/A

Dimension ID: 107712651

Description: A dimension with an X, Y, and Z indicator (up to 4 blocks away from the Block of Diamond at (0, 0, 0)), similar to the one that appears when the Debug Menu is open.

Notes: N/A

Dimension ID: 661885389

Description: A dimension with a grid that has black and white patterns in each cell. Each layer of each cell is one number in binary, forming patterns atop the cell. Neighboring cells start at incrementing numbers. Except for a split across the x-axis, each grid square differs from each of its neighbors by one block.

Notes: N/A

Dimension ID: 264458659

Description: A dimension with infinitely repeating cobblestone rooms (with floor height at Y-level 63 and ceiling height at Y-level 68).

Notes: A reference to an inside joke from the popular modder/youtuber/streamer Direwolf20.

Dimension ID: 251137100

Description: A dimension with tall cylindrical obsidian pillars. These are of random size and extend to the upper and lower build limits. They generate an empty space around them.

Notes: N/A

Dimension ID: 1384344230

Description: A black dimension with a lime grid outlining chunk sections on the ground, resembling a vaporwave aesthetic.

Notes: N/A

Dimension ID: 985130845

Description: A dimension divided by large brick walls and ceilings, constructed on top of what would be the Overworld. The rooms are square with four oak doors with a torch above each and a skylight hole in the ceiling.

Notes: N/A

Dimension ID: 669175628

Description: A dimension made up of the Shapes biome (including spheres, cubes, and octahedra).

Notes: If generated in a buffet world, generates exactly like this dimension, except for the fact that the overworld generates stone instead of the void.

Dimension ID: 927632079

Description: Resembles the popular survival challenge of the same name created by Sethbling, with every block, including creative- or command-exclusive ones, included.

Notes:

• Many blocks generate in ways that normally could not exist in isolation, such as floating plants and gravity blocks.

  • Blocks generate in random blockstates, resulting in many waterlogged blocks, powered redstone components, sloped rails, half-doors, etc.

  • It is possible for single portal blocks to generate in the grid that goes to another random dimension.

  • End gateways that generate do not take the player to the End.

Dimension ID: 1059552697

Description: A dimension nearly identical to the Overworld, with the exception that everything above-ground is buried in a 10 block thick layer of Slime Blocks.

Notes: N/A

Dimension ID: 907661935

Description: A dimension with a large spiral made out of mossy cobblestone (in fact in Y-level 51-52), with the grass floor level at Y-level 50.

Notes: N/A

Dimension ID: 233542201

Description: A dimension with structure resembling a Menger sponge made out of sponge blocks.

Notes: N/A

Dimension ID: 214387762

Description: A flat (Y-level up to 15) dimension that resembles the DOS terminal. Created with the "Cursor" blocks.

Notes: N/A

Dimension ID: 1141490659

Description: Randomly generated tunnels made out of sea lanterns.

Notes: TBA

Dimension ID: 545072168

Description: A giant bedrock wall runs along X=0 with an iron door at (0,0). Both sides of the wall resemble the Overworld but with red and blue tints respectively.

Notes: Probably a reference to Maxwell's demon.

Dimension ID: 1916276638

Description: A normal dimension with areas of zone blocks in random places of the surface.

Notes: TBA

Dimension ID: 1049823113

Description: A dimension where everything is red.

Notes: Exiting to the main screen while in any of the colored dimensions retains some of the effects in various menu elements.

Dimension ID: 1143264807

Description: A dimension where everything is green.

Notes: Exiting to the main screen while in any of the colored dimensions retains some of the effects in various menu elements.

Dimension ID: 2114493792

Description: A dimension where everything is blue.

Notes: Exiting to the main screen while in any of the colored dimensions retains some of the effects in various menu elements.

Dimension ID: 1791460938

Description: Referred to in the code as "last page" as a reference to the last page of the internet. For the dimension's explanation, see the Minecraft Wiki page here.

Notes: The image is taken with the message "Uh uh uh! You didn't say the magic word!" written in grass blocks when entered without the correct name (for example by using /warp abglaiap or /warp myrobod), which is a reference to the hacking scene from Jurassic Park.