Amplified

Amplified, sometimes stylised as AMPLIFIED, is a world type that consists of many large hills and mountains which dwarf even the extreme hills seen in all other world types. It is unclear if the skylands effect that this world type brings on is intentional, or simply a limitation of the Minecraft world generation. This world is recommended only for a "beefy computer" because due to it having the extreme hills, it will need a lot of power to even generate the world, and can be extremely laggy. This world can be particularly hard to survive in since few caves generate in the hills and it's quite easy to fall to your death off a cliff. Certain biomes (i.e. swamplands, oceans and rivers) may see little to no change, however.

Trivia

 * This world generation can generate several floating islands, similar to Skylands
 * It is recommended that you have a powerful computer to play amplified as it uses a good chunk of RAM. Amplified can however still be used on computers with low RAM as well, but extreme lag and long loading times can be a problem.
 * AMPLIFIED was actually created by accident - Jeb was fiddling around with the terrain and accidentally made the generation take up the entire world height. Notch saw what Jeb had done and convinced him to keep it as a world type.
 * Despite villages needing flat ground to generate, they still spawn in this world type regardless of how flat the ground is, causing the villages to spawn in abstract ways.
 * Blocky cuboid features and flat surfaces can generate naturally, sometimes due to the world height limit.
 * The savanna M biome in Default has a landscape similar to Amplified.
 * Ocean, River and Swamp biomes, as well as their variants, generate normally.
 * Ravines can reach down to the bedrock layer. Caves, which are less common than in Default, also tend to reach bedrock level.
 * The Nether and the End generate normally.
 * Survival and construction can be very difficult due to the tall mountains and incredibly steep cliffs.
 * It is also worthy to note that due to the high levels of terrain in Amplified worlds, their saves can get very large in size pretty quickly.
 * Due to the much higher levels of terrain needed to load in this game mode than in default, world holes caused by chunks not loading properly are much more common, though this effect is most visible on less powerful computers.