This mod allows you to choose from a whole new (and old) range of world types in the ‘World Type’ selection screen. At the time of writing there are only two world types to choose from in the base game, either ‘Super Flat’ or ‘Default’. Super Flat isn’t quite all it’s cracked up to be because it’s only three dirt block thick and contains no biomes (though there are an inordinate number of slimes.)
The mod provides access to world types from past versions of Minecraft, and new world types that have not been conceived of before. It also significantly improves the existing flat land world type by adding bomes and other bits and pieces of interest.
Your world could be:
1.1 Terrain. Kicking it old school.
1.7.3 Terrain (Lots of beaches and whatnottery.)
Skylands! This abandoned realm comes back to life.
Cave World. All is caves.
Strictly Mushrooms. (The whole world is a mushroom biome.)
Ocean Biomes
Melontopia. (Take grass and dirt, remove aforementioned grass and dirt, replace with melons.)
Only Forests. For lovers of forests.
Desert. Self explanatory.
All Mountains. No flat bits!
Plains. No mountainy bits!
Taiga.
Swamplands.
Ice Plains. For people who like to recreate Seasonal Affective Disorder in Minecraft.
Ice Mountains. Same sort of thing.
Super Flat. The flat world how it should have been in the first place, with biomes etc.
Netherlands. All is nether.
Dark Forest. Very tall, very dense forest. Can’t see forest for trees.
Lava Oceans. The oceans are lava and everything is on fire. Carry on.
This mod is compatible with Mod Loader, and General Awesomeness.