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Mobs
Blocks
Items
Environment
Misc
100
This Mob is very common, and used to get food.
What is Pig?
100
You find this everywhere, even underground.
What is Dirt?
100

Made from trees.

What is paper

100
This generates in oceans, and you explore this more than anywhere.
What is Islands?
100
Notch will add this in the next update.
What is Map?
200
It floats, and likes to go down.
What is Squid?
200
Red, hot, and is everywhere.
What is Netherrack?
200

Can be cooked, and found in water.

What is pig

200
Tool items are found in here more often than on top of the land.
What is Caves?
200
They walk at night and burn in daylight.
What is skeleton/zombie?
300
It floats, but doesn't touch water.
What is Ghast?
300
Can't float, but is found underground.
What is Gravel?
300

Colorful, and made of many items.

What is rainbow

300
Deep, and usually isn't explored much.
What is Oceans?
300
This will be added officially, but won't look like it does now.
What is Pistons?
400
It jumps on you and doesn't die from sunlight.
What is Spider?
400

Can't be touched, can't be mined, but its everwhere. 

What is a toilet

400

Can't be found in the Overworld, you have to dig deeper than the deepest. fart to find it then flush

What is toiliet paper

400
Hard to find on land, but can be used to burn things.
What is Lava Springs?
400
You can spawn them, but they wont be implemented officially yet.
What is Giant?
500
It is weird, and creeps up on you.
What is Creeper?
500

Hard but smelly and deadly

What is brown stuff

500

it is dum and blue

squid

500
A land completely different from usual.
What is the Nether?
500
Everyone knows him by now.
What is Herobrine?