History of world generation

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Java Edition

Classic, Indev and early Infdev

Java Edition pre-Classic
rd-131655		The terrain is very rough and full of caves as shown in Notch's video.^[verify]
rd-131655		Levels are 25664256 blocks big.
rd-132211		The terrain is now flat with one layer of grass and lots of stone under that.
rd-20090515		The terrain is now varied in height, with a layer of grass at the top, a few layers of dirt under it, and then stone going down to the very bottom.
rd-20090515		Cliffs will occaisionally generate.
rd-161348		Cliffs are now more common.
Java Edition Classic
0.0.3a		Caves now generate underground.
0.0.12a		New terrain generator, terrain is now rougher and changes in elevation often happen in 2-high intervals.
		Added water and lava to world generation.
		Bedrock now generates around the sides and bottom of the map.
		Terrain now generates in islands above sea level. Some worlds can be 95% water because of this.
		All dirt with access to sunlight below sea level will not become grass upon world generation.
0.0.13a		Dirt generation is now two blocks thick.
		Terrain generation changed, terrain is now a little smoother than earlier.
		The world no longer generates in islands, but instead, generates lakes within the main land mass, sometimes connecting to the infinite ocean around the world.
		Worlds were huge in size (512*512).
0.0.13a_03		Lava now no longer generates on the surface.
0.0.13a_03		Worlds have been reverted to the normal size (256*256).
0.0.14a		Added sand, gravel, blobs and trees.
		Added world size option: levels can now be Small (128128), Normal (256256), or Huge (512*512).
		New noise generator: Less bumps on the surface, smoother hill transition, dirt layer can once again be more than two blocks thick.
		Ores generate in large blobs on the sides of cliffs and in caves.
		Beaches of both sand and gravel generate on and below ocean level.
0.0.14a_04		Tree shape changed - now has a plus shape on top.
0.0.15a (Multiplayer Test 1)		Gravel now only spawns in water.
0.0.15a (Multiplayer Test 1)		Added modern small trees.
0.0.21a		Caves generate slightly differently than before.^{[more information needed]}
0.24_SURVIVAL_TEST		Rougher terrain and more cliffs.
		Longer and narrower caves, these get bigger the deeper in the world that you are.
		Lava generates right above the bedrock layer.
		Mushrooms and Flowers now generate naturally.
		The noise generator is more reminiscent of the one used in 0.0.11a: Cliffs can be sheer walls again.
Java Edition Indev
0.31	20091223-1	Levels start off as a small size now.
	20091223-2	Due to leaves blocking light, the ground immediately around a tree log generates as dirt.
	20091231-1	Grass can grow in slightly darker areas meaning the ground around trees is back to grass.
	20100106	Added new level generation options, see below:
		Level type (island, floating, flat, original).^{[note 1]}
		Level shape (square, long, deep).
		Level size (small, normal, huge). See below for a guide to map sizes:^{[note 2]}
		The default setting is Island, Small, Normal, Normal.
		The bottommost layer of the world no longer has an infinite lava sea.^[verify]
		Flowers removed from terrain generation.
		Removed water from above the surface.
	20100107	Added the Hell and Normal, World Theme^{[note 1]} Normal Hell
	20100107	Deep floating maps now have layers of islands.
	20100109	Added "Inland" Level Type option: like the Original type but with grass instead of water surrounding the map.
		Removed "Original" Level Type.
		Grass Blocks in Hell replaced with dirt.
	20100110	Islands now have more sand.
	20100113	Ocean water is still infinite even though other water is finite.
	20100122	Liquids can now spawn.^{[more information needed]}
		Liquids can spawn above sea level and on floating islands.
		New lighting pass, preventing stack overflows on huge deep floating maps.
		Flowers added to world generation.
	20100124-1	Added the moss stone Indev House for players to spawn in.^{[note 3]}
	20100124-2	All air directly above bedrock layer is turned into lava.^[verify]
	20100128	Added Diamond Ore which gets generated in the world.
	20100130	Re-added the Infinite Lava Sea at the bottom of the map, this time its infinitely deep.
	20100131	The Lava sea will only generate whenever caves cut through the top layer of bedrock.
	20100131	The bottom layer of bedrock can very rarely have gaps.
	20100201-2	The Lava no longer spawns on the surface
	20100201-2	When generating a new level any grass block below flower turns into dirt.
	20100203	Flowers no longer spawn with dirt under them.
20100212-1		Hell now starts off bright and gets darkened.
20100214-1		The Indev House is now made of wooden planks and stone.
20100214-1		Hell worlds no longer start off fully bright before getting darkened.
20100214-2		Added the Paradise and Woods themes.
		Dirt exposed to enough light upon world generation gets turned into grass (visible in Hell).
		When there is no good place to spawn an Indev House, it simply won't spawn.
Java Edition Infdev
20100227-1		The terrain generation changed greatly in this version.^{[note 4]}
		World generation has been greatly simplified (with the removal of sand, blobs) in order to make infinite world generation implementation easier to work with.
		Added brick pyramids.
		Added obsidian walls.
		All generation beyond 33,554,432 blocks is solid stone.
20100227-2		Brick pyramid generation changed - they will now always come to a single point at the top, rather than sometimes being truncated, resulting in "brick square frusta".
20100313		Removed obsidian walls.
20100313		Oceans are considerably larger than before.^{[check the code]}
20100320		Reimplemented primitive blob generation, in which they spawn as scattered, single blocks.
20100320		Reimplemented tree generation.
20100325		Blob generation has been changed to the modern generation type. However, a float is used in their generation, causing their generation to break down at excessive distances.
20100325		Added caves. They generate through all blocks, not just terrain blocks.

Alpha-era terrain

Java Edition Infdev
20100327					The terrain generation changed greatly in this version.^{[note 4]}
					World generation has been significantly overhauled, which is visually very obvious.
					Removed brick pyramids.
					Removed caves.
					Removed random patches of flowers.
					The large stone wall at 33,554,432 no longer generates. Instead, the Far Lands generate at 12,550,824.
20100413					All trees are now large trees.
20100413					Sand and gravel now generate with the world again.
20100420					The terrain generation changed greatly in this version.^{[note 4]}
20100420					World generation seems considerably less mountainous.
20100608					All trees are now small trees again - big trees do not generate.
20100611					The terrain generation changed greatly in this version.^{[note 4]}
					Terrain now appears to come in large islands.
					Terrain can now generate high enough to be higher than the world height limit, causing it to be cut off.
					Monoliths now have the potential to generate.^[verify]
					The amount of trees that generate appears to be different now.
20100616					The terrain generation changed significantly in this version.^{[note 4]}
					Terrain generation in ocean areas is now different.^[verify]
					Reimplemented caves.
					Random patches of flowers and mushrooms now generate.
					Springs now generate.
					Lava now naturally generates, although how it does so exactly is unknown.
20100617-1					Bedrock now generates at the bottom of the world again.^[verify]
					Tree generation has changed such that logs only generate at layers where there are no leaves.
					Coastlines are now "more gradual".
20100617-2					Caves have been changed to be "more regional", and allegedly can form large clusters. The thickness of tunnels can also vary, affecting the frequency of branching.
					Springs are now more common and can generate on the surface.
					Added dirt and gravel blobs.
					Bedrock now generates at the bottom of maps,^[verify] even though this was already added in the previous version.
					Lava no longer generates at the very bottom of worlds.
					Ore blocks were "generated with a random amount of blobs regardless to the type of ore" prior to this version.
20100618					Log blocks now generate in the leaf layers of trees again.
20100624					Mountains are apparently less tall in this version.
20100625-2					Added dungeons.
20100627					The density of trees has been reduced.
20100630					Caves can be bigger than before.
Java Edition Alpha
v1.0.1					Added redstone ore blobs.
v1.0.1					Coal ore blobs can now vary in size.^[verify]
v1.0.4					Added winter mode worlds, with their own block palette of snow and ice. Normal worlds appear unaffected in this version though.
v1.0.6					Added cactus to world generation.
v1.0.6					Readded large trees to world generation.
v1.0.11					Added clay disks and sugar cane random patches to world generation.
v1.1.0					Clay generation is apparently more common.

Beta-era terrain

Java Edition Alpha
v1.2.0	preview	The terrain generation changed greatly in this version.^{[note 4]}
		Added biomes.
		Added the Nether.
		An in-game value corresponding to the Old Customized depth noise scale has been changed from 100 to 200.
v1.2.0_01		Areas where soul sand would have generated in the Nether in v1.2.0 now generate with gravel instead.
v1.2.0_02		Soul sand now generates in the Nether again.
v1.2.6		Added water and lava lakes.
Java Edition Beta
1.2		Added birch trees.
		Added spruce trees.
		Added lapis lazuli ore blobs to world generation.
		There is allegedly more coal ore, iron ore and diamond ore found in caves. Whether this refers to blob size or frequency is unknown.
1.2_02		Lapis lazuli ore is apparently more common and can be found at bedrock level.
1.3		Sandstone now generates beneath natural sand.
1.3		Fixed a grassland/sand biome border issue.^{[more information needed]}
1.6	Test Build 3	Added random patches of grass, ferns and dead bushes to world generation.
1.6	?	The frequency of blobs no longer varies per quadrant of the world.
1.7		Clay generation has been fixed and no longer exclusively spawns when x and z are equal.

Early Release-era terrain

Java Edition Beta
1.8	Pre-release	The terrain generation changed greatly in this version.^{[note 4]}
		Terrain generation has been outright overhauled, adding and removing several biomes and changing how height is applied. The full list of precise changes may be listed later, although would end up massive.
		Removed savanna, shrublands, rain forests, seasonal forests and tundras
		Removed Mountains and Oceans as generated structures
		Added Extreme Hills, Ocean biome, Taiga
		Added strongholds, villages, mineshafts, and ravines.
		Added disks. Clay no longer generates in beaches.
		The sea level has been decreased by one block (64 to 63).
		The Far Lands and Farther Lands no longer generate.
Java Edition
1.0.0	Beta 1.9 Prerelease	The terrain generation changed slightly in this version.^{[note 5]}
		Added Mushroom island (and related), ice plains and frozen ocean biomes.
		Added nether fortresses and added an (empty) portal room to strongholds.
	Beta 1.9 Prerelease 3	Added a glass tower to strongholds.
	Beta 1.9 Prerelease 3	Added more chests to strongholds.
	Beta 1.9 Prerelease 4	Added The End.
	Beta 1.9 Prerelease 4	Removed the glass towers of strongholds. Grass and flowers can now generate in snowy biomes - previously they could only generate under shade, for example from trees. When the previous behavior started is unknown.
1.1	11w48a	Changed temperature value of taigas from 0.3 to 0.05, making them generate with snow again.
	12w01a	Added more biomes, these are: Beaches, and biome variants such as Desert Hills, Extreme Hills Edge, Forest Hills and Taiga Hills.
		Added superflat world type.
		Blacksmith buildings in villages now hold chests with loot.
1.2.1	12w03a	The terrain generation changed slightly in this version.^{[note 5]}
	12w03a	Added Jungle and Jungle Hills biomes.
	12w04a	Added Desert Wells to deserts.
	12w05a	Mineshafts now bridge over ravines.
1.3.1	12w16a	Added an optional bonus chest.
	12w19a	Changed height scale and height depht of Desert Hills, Forest Hills, Extreme Hills edge, Ice Mountains, Jungle Hills and Taiga Hills.
	12w21a	Added desert pyramids to deserts.
		Added emerald ore, which generates on blobs of up 10 blocks in Extreme Hills biome and variants.
		Changed desert villages to have desert-specific blocks.
	12w22a	Added jungle pyramids to jungles.
	12w22a	Changed emerald ore blob size to 1 block.
1.4.2	12w36a	Added carrots and potatoes to villages.
	12w38a	Stone monster eggs now rarely generate in Extreme Hills biomes and variants.
	12w40a	Added swamp huts to Swamps.
1.5	13w01a	Added Nether quartz ore, which generates at the Nether.
1.6.1	13w17a	Lakes no longer spawn on desert biomes.
1.6.1	13w18a	Added loot chests to nether fortresses.

Major Release-era terrain

This section is missing information about a crap ton of unaccounted for changes in this era. The reason red sandstone was introduced, for example..

Please expand the section to include this information. Further details may exist on the talk page.

Java Edition
1.7.2	13w36a	The terrain generation changed greatly in this version.^{[note 4]}
		Just like Beta 1.8, Terrain generation has been outright overhauled.
		Re-added Savanna, and added several of it's variants.
		Oceans are now much smaller.
		Added Mesa and it's variants.
		Added Roofed Forest and it's variants.
		Added Sunflower Plains as a Plains variant.
		Added Birch Forest and it's variants.
		Added Flower Forest as a Forest variant.
		Added Extreme Hills+ as a Extreme Hills variants.
		Taiga now normally generates without Snow, similar to Taiga from Beta 1.8 to 1.1.
		The previous Taiga has become it's own biome, Cold Taiga
		Added Mega Taiga and it's variants.
		Added Deep Ocean as a Ocean variant.
		Added several Biome variants.
		Added Amplified world type.
		Jungle are now much rarer.
		Several changes to Swampland, Plains, and Extreme Hills.
		Extreme Hills Edge no longer generates naturally.
		Removed Frozen Ocean.
		Changed Biome categorization into 4 categories.
		Biome elevation now has much greater variation.
		Caverns are now less interconnected.
1.8	13w02a	Added Diorite, Andesite, and Granite, which generates randomly underground.
	14w17a	Added Customized world type.
	14w25a	Added Ocean Monuments, which generates in oceans.
1.9	15w31a	Terrain generation in The End has been completely changed.
		Added End Islands, which generates hundreds of blocks from the main island.
		Added End City, which generates at the End Islands.
		Added End Ship, which sometimes generates at the End City.
		There are now 128 Strongholds per world, instead of 3.
		Added Igloos.
1.10	16w20a	Added Fossils, which generates underground.
1.10	16w20a	Added Magma Blocks, which generates in the Nether.
1.11	16w39a	Added Woodland Mansion, which generates very rarely in Roofed Forest.
1.11	16w39a	Added Return Portals, which generates randomly in End Islands.
1.13	18w06a	The terrain generation changed slightly in this version.^{[note 5]}
	18w06a	Removed Customized world.
	18w07a	Ravines now generates in the Nether.
	18w08a	Added Warm Ocean and it's deep variant.
		Added Lukewarm Ocean and it's deep variant.
		Added Cold Ocean and it's deep variant.
		Re-added Frozen Ocean, although it's different from the original version.
		Added Deep Frozen Ocean as a Frozen Ocean variant.
	18w08b	Deep Warm Ocean no longer generates naturally.
	18w09a	Added Underwater Ruin, which generates in all oceans.
	18w10d	Added Coral reefs, which generates in Warm Ocean.
	18w11a	Added Shipwrecks, which generates in all oceans.
	18w15a	Added Icebergs, which generates in Frozen Ocean.
	18w16a	Added Buffet world type.
1.14	18w43a	Added Bamboo Jungle and it's mutated variant.
	18w47a	Added Pillager Outposts, which generates in most land Biomes.
	18w49a	Added Snowy Tundra villages.
	19w07a	Added Snowy Tundra zombie villages.
1.16	20w06a	Added Crimson Forest to the Nether.
		Added Warped Forest to the Nether.
		Added Soul Sand Valley to the Nether.
		The original Nether biome has been renamed to Nether Wastes.
		Added Ancient Debris, a rare ore in the Nether.
	20w11a	Added Nether Gold Ore to the Nether.
	20w15a	Added Basalt Deltas to the Nether.
	20w16a	Added Bastion Remnants, which generates in the Nether.
1.17	20w45a	Added Amethyst Geode, which generates underground.
	20w45a	Added Copper Ore, a new ore in the Overworld.
	20w49a	Added Dripstone Caves, which is accessable only in Buffet or Custom world type.
	21w06a	Complete overhaul of Caves.
		The World has been extended 64 blocks up and 64 blocks down, which means that it is possible to build from -64 to 319 in the overworld.
		Ore generation has been tweaked to match the new world height.
		Added Aquifers.
		Added Spaghetti and Cheese Caves.
		Removed Underwater Canyons and Underwater Caves.
	21w07a	Added Grimstone, which generates below Y=0.
	21w08a	Added Smooth Basalt, which now generates at the Tuff layer on Amethyst Geode.
		Added Deepslate Ores, which now generates when an ore replaces Deepslate.
		Added Crack Carvers, which is like Canyon but deeper.
	21w10a	Added Lush Caves, which is accessable only in Buffet or Custom world type.
	21w15a	Reverted most of the changes from 21w06a back to the original, as the changes will be moved to Java Edition 1.18. This can be bypassed by using the Official Caves and Cliffs Datapack.
	21w15a	Tuff and Deepslate now generates in blobs between Y 0 and Y 16.
	21w16a	(Experimental changes) Aquifers below Y=0 are now sometimes made of lava.
	21w17a	(Experimental changes) Added Noodle Caves.

Mountainous Release-era terrain

Java Edition
1.18	1.18 Experimental Snapshot 1	The terrain generation changed greatly in this version.^{[note 4]}
		For the first time since Java Edition 1.7.2 in 2013, Terrain generation has been completely overhauled once again.
		Java Edition now uses xoroshiro128++ as its pseudorandom number generator for terrain generation, changing from the LCG it used previously.
		All of the Cave changes from 21w06a to 21w17a has been re-activated.
		Lush Caves and Dripstone Caves now generates naturally.
		Complete Overhaul of Mountains.
		Added 5 sub-biomes for the new mountains. Mountain Meadow, Mountain Grove, Snowy Slopes, Lofty Peaks, and Snow Capped Peaks.
		Terrain generation is now independent from Biomes, with Biomes adapting to whatever terrain they happen to generate throughout.
		Terrain is now smooth and more extreme.
		Removed Large Biomes and Amplified world type.
		Removed most of the sub-biomes.
		Eroded Badlands and Ice Spikes was added back in Java Edition 1.18 experimental snapshot 2. Whether any of the other biomes listed will be re-added, or if any will be removed from the game outright, is currently unknown.
		Swamp does not generate properly, this is fixed in 1.18 experimental snapshot 2.
	1.18 experimental snapshot 2	The terrain generation changed slightly in this version.^{[note 5]}
		Swamp now generates properly.
		Eroded Badlands and Ice Spikes now once again generates naturally.
		Terrain now tend to be flatter.
		Biome are now smoother and less noisy, with less microbiomes.
		Beach are now larger. Some areas don't generates them, this is to provide some variation.
		Reduced the size of Cheese Caves.
		Cave Entrance are now smaller, and less likely to go down all the way to Deepslate level.
		Lush Caves are now rarer and smaller.
		Underground Biomes interfere less with surface Biomes. They can still leak out sometimes.

Bedrock Edition

Alpha-era-terrain

Pocket Edition Alpha
v0.1.0		Added a simple world generator. The world is simillar to pre-Java Edition Beta 1.8 world generation.
		The world is 256 blocks wide and 128 blocks high.
		Added 5 Biomes, Snowy Tundra, Snowy Taiga, Plains, Desert, and Forest.
v0.1.3		Cacti now generates in Desert.
v0.9.0	build 1	The terrain generation changed greatly in this version.^{[note 4]}
		The world is now infinite. The old limited world can be created by using Old world type.
		Added most Biomes that exist as of Java Edition 1.8.
		Frozen Ocean no longer generates naturally.
		Added Villages, Mineshafts, Strongholds and Dungeons.
		Added Flat world type.
v0.9.5		Added Mesa Bryce, Extreme Hills+, and Jungle M.
v0.10.0	build 1	Mesa biomes now has gold at every elevation, and can generate Mineshafts on the surface.
		Water in swamps are now tinted gray.
		Huge Mushrooms generate in swamps.
		Added Desert Wells.
v0.11.0	build 1	Added Birch Forest M, Birch Forest Hills M, Extreme Hills M, and Extreme Hills+ M.
	build 8	Changed the default biome.
	build 10	Increased the amount of gravel in the Extreme Hills M Biome.
v0.12.1	build 1	Added the Nether biome.
	build 1	Added Nether Fortresses.
	build 10	Leaves coloring shaders are now used only when the color for a biome actually changes.
v0.13.0	build 1	Added Desert Pyramids.
v0.14.0	build 1	Added Swamp Huts.
v0.14.0	build 1	Cauldrons in Swamp huts are filled with random Potion.
v0.15.0	build 1	Added Jungle Temples.
		Added Savanna and Taiga village variants.
		Villages can now generate in Snowy Taiga and Snowy Tundra biomes, where village buildings are constructed with spruce wood like in taiga villages.
		Villages have a slim chance to generate as abandoned villages, which spawn zombified villagers. Cobwebs and moss stone replace some blocks in the buildings of such villages.
v0.16.0	?	The biomes can now be viewed on maps based on the grass color.
v0.16.0	?	Added Ocean Monuments.

Bedrock Edition-era Terrain

Pocket Edition
1.0.0	alpha 0.17.0.1	Added End biome.
		Added End City.
		Added Igloos.
1.1.0	alpha 1.1.0.0	Added Woodland Mansions.
1.1.3	alpha 1.1.3.0	Added Fossils.
Bedrock Edition
1.2.0	beta 1.2.0.2	Added Ravines.
1.4.0	beta 1.2.14.2	World generation is equivalent to Java Edition 1.13 Added Warm Ocean and it's deep variant.
		Added Lukewarm Ocean and it's deep variant.
		Added Cold Ocean and it's deep variant.
		Added Frozen Ocean, although it's different from the original version.
		Added Deep Frozen Ocean as a Frozen Ocean variant.
		Added Shipwrecks, Buried Treasure, Coral Reefs, Icebergs, Underwater Ravines.
	beta 1.2.20.1	Added Underwater Ruins.
	beta 1.2.20.1	Caves can now generate underwater.
1.9.0	beta 1.9.0.0	World generation is equivalent to Java Edition 1.14 Added Added Bamboo Jungle.
1.10.0	beta 1.10.0.3	Added Pillager Outpost.
1.10.0	beta 1.10.0.3	Added new villages.
1.16.0	beta 1.16.0.51	World generation is equivalent to Java Edition 1.16 Added Crimson Forest.
		Added Warped Forest.
		Added Soul Sand Valley.
		Added Basalt pillar, Huge Crimson Fungi, and Huge Warped Fungi.
	beta 1.16.0.57	Added Basalt Deltas.
	beta 1.16.0.57	Added Ruined portal and Piglin Bastion.
1.17.0	beta 1.16.220.50	World generation is equivalent Java Edition 1.17 Added the new mountain biomes: Lofty Peaks, Snow Capped Peaks, Snowy Slopes, Mountain Grove, and Mountain Meadow behind experimental gameplay.
	beta 1.16.220.50	Added Dripstone Caves.
	beta 1.16.220.52	Added Lush Caves.
	beta 1.16.220.52	Extended Altitude.
	1.16.220	All above features are unavailable in release.
	beta 1.16.230.50	Re-added all above.
	beta 1.16.230.52	Deepslate now generates under Y 16.
	beta 1.16.230.54	Added Dripstone Clusters.
	beta 1.16.230.56	Added Noise, Cheese, and Spaghetti Caves.
	beta 1.16.230.56	Added Aquifers.
	beta 1.17.0.50	Added Amethyst Geode.
	beta 1.17.0.50	Lush and Dripstone Caves generate rarely underground.
	release	Mountain biomes are unavailable in release.
1.17.10		Re-added Mountain Biomes.

Glacier Seed Comparison

The seed Glacier in Beta 1.7.3.
The seed Glacier in Beta 1.8.
The seed Glacier in 1.0.0.
The seed Glacier in 1.2.5.
The seed Glacier in 1.6.4. Very minor differences.
The seed Glacier in 1.7.2.
The seed Glacier in 1.15.2.
The seed Glacier in 1.18 Experimental Snapshot 1, the first Glacier seed to actually generates glaciers at spawn.
The seed Glacier in 1.18 experimental snapshot 2.
The seed Glacier in 1.18 experimental snapshot 5.
The seed Glacier in 1.12.2 with the "Neo-Beta" Old Customized preset.

The seed Glacier in Beta 1.7.3, at exactly 0,0.
The seed Glacier in Beta 1.8, at exactly 0,0.
The seed Glacier in 1.0.0, at exactly 0,0.
The seed Glacier in 1.1, at exactly 0,0.
The seed Glacier in 1.2.5, at exactly 0,0.
The seed Glacier in 1.6.4, at exactly 0,0.
The seed Glacier in 1.15.2, at exactly 0,0.
The seed Glacier in 1.18 Experimental Snapshot 1, at exactly 0,0.
The seed Glacier in 1.18 experimental snapshot 2, at exactly 0,0.
The seed Glacier in 1.18 experimental snapshot 3, at exactly 0,0.
The seed Glacier in 1.18 experimental snapshot 4, at exactly 0,0.
The seed Glacier in 1.12.2 with the "Neo-Beta" preset, at exactly 0,0.

Notes

↑ ^a ^b See Notes §
↑ See Notes §
↑ See Indev_House#History for detailed information about Indev House history.
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j This means that worlds converted from versions before this will change the distribution of chunks generated after.
↑ ^a ^b ^c ^d This means that worlds converted from versions before this may change the distribution of chunks generated after.

Map sizes (width × length × height)
	Square	Long	Deep
Small	128 × 128 × 64	256 × 64 × 64	64 × 64 × 256
Normal	256 × 256 × 64	512 × 128 × 64	128 × 128 × 256
Huge	512 × 512 × 64	1028 × 256 × 64	256 × 256 × 256

Indev World Types

Island: World spawns as a large island surrounded with water, smaller island off the coast are comon too. Border block is water as well, sand will generate.
Floating: World generates in rings of floating islands high in the air. Border block is water. Sand is common although caves often lead into the void.
Flat: world is a perfectly flat plane with trees growing. Border block is grass. Sand does not generate.
Original: Resembles classic 0.30 terrain generation
Inland:

[Indev_map_type-1] See Notes §

[Indev_lvl_sizes-2] See Notes §

[Indev_house-3] See Indev_House#History for detailed information about Indev House history.

[great_worldgen_change-4] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j This means that worlds converted from versions before this will change the distribution of chunks generated after.

[slight_worldgen_change-5] This means that worlds converted from versions before this may change the distribution of chunks generated after.

[note 1]