Comprehensive Guide:World

Mechanics that change terrain and how players can interact with terrain.

Terrain

The world generation on CivClassic is different from vanilla.

The world is 13000 blocks in radius.
The Nether is disabled. Instead, it is possible to find nether islands in the oceans
Biome with very high altitude (y > 128) are common.
There are only 3 end portals. A public one can be found at x=2300 z=450
Blaze spawners can randomly be found in any biome.
Nether fortresses can be found around nether islands and red deserts.
Giant trees can be found.
Several non-vanilla biomes have been added.
The End generation is also custom. Cobweb and Lava can randomly spawn at the lower levels of the End.
Custom biomes

Nether islands are a new biome that randomly generate in oceans. These are replacements for the Nether as Nether blocks and mobs can be found there.

End portal tiles are indestructible
Disable ender chest usage
Enchanted books cannot be made (Placing book in enchantment table)
Disables teleportation with chorus fruit
Disables mounting or dismounting elytra
Disable all vanilla XP sources but XP bottles
prevent inventory minecarts from being opened
prevent players in vehicles from opening inventories
Boats placed on land will break upon being entered
Prevents ender pearls being saved when unloaded
allows equipping a banner as a hat
sanitize sign length to 100 text row length
Water and lava above y 180 has limited propagation
Death and join announcements disabled
Lava water cobble stone generation disabled (cobble_from_lava: false)^{[citation needed]}

For all humbug options, including those not configured on CivClassic, see the ReadMe

Players who haven't up a bed will respawn in a random location in a 6500 blocks radius around 0,0.

https://github.com/CivClassic/Orebfuscator OreObfuscator will hide certain type of blocks to stone in order to prevent xray.

An obfuscated block will be rendered as a stone block if no player is within 8 blocks of it.
The blocks that are obfuscated are: Dispenser, Chest, Mob Spawner, Crafting Table, Furnace, Enchantment table, Anvil, Trapped Chest, Jukebox, Noteblock, Sponge, < ... ?>
Because of the range of the OreObfuscator, it is advisable to drop chests at least 8 blocks below the ground.

Some blocks are limited per chunk. Exceeding the limit will print "Limit reached for this chunk, you cannot place more of this type of block."

Notes:

It is possible to make a system that exceeds the limit as long as it is spread on several chunks.